aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_view/helpers/date_helper.rb
blob: d306c7a742cb441211f46f1eee4b9b491bb0919b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
require "date"
require 'action_view/helpers/tag_helper'

module ActionView
  module Helpers
    # The Date Helper primarily creates select/option tags for different kinds of dates and date elements. All of the select-type methods
    # share a number of common options that are as follows:
    #
    # * <tt>:prefix</tt> - overwrites the default prefix of "date" used for the select names. So specifying "birthday" would give
    #   birthday[month] instead of date[month] if passed to the select_month method.
    # * <tt>:include_blank</tt> - set to true if it should be possible to set an empty date.
    # * <tt>:discard_type</tt> - set to true if you want to discard the type part of the select name. If set to true, the select_month
    #   method would use simply "date" (which can be overwritten using <tt>:prefix</tt>) instead of "date[month]".
    module DateHelper
      include ActionView::Helpers::TagHelper
      DEFAULT_PREFIX = 'date' unless const_defined?('DEFAULT_PREFIX')

      # Reports the approximate distance in time between two Time or Date objects or integers as seconds.
      # Set <tt>include_seconds</tt> to true if you want more detailed approximations when distance < 1 min, 29 secs
      # Distances are reported based on the following table:
      #
      #   0 <-> 29 secs                                                             # => less than a minute
      #   30 secs <-> 1 min, 29 secs                                                # => 1 minute
      #   1 min, 30 secs <-> 44 mins, 29 secs                                       # => [2..44] minutes
      #   44 mins, 30 secs <-> 89 mins, 29 secs                                     # => about 1 hour
      #   89 mins, 29 secs <-> 23 hrs, 59 mins, 29 secs                             # => about [2..24] hours
      #   23 hrs, 59 mins, 29 secs <-> 47 hrs, 59 mins, 29 secs                     # => 1 day
      #   47 hrs, 59 mins, 29 secs <-> 29 days, 23 hrs, 59 mins, 29 secs            # => [2..29] days
      #   29 days, 23 hrs, 59 mins, 30 secs <-> 59 days, 23 hrs, 59 mins, 29 secs   # => about 1 month
      #   59 days, 23 hrs, 59 mins, 30 secs <-> 1 yr minus 1 sec                    # => [2..12] months
      #   1 yr <-> 2 yrs minus 1 secs                                               # => about 1 year
      #   2 yrs <-> max time or date                                                # => over [2..X] years
      #
      # With <tt>include_seconds</tt> = true and the difference < 1 minute 29 seconds:
      #   0-4   secs      # => less than 5 seconds
      #   5-9   secs      # => less than 10 seconds
      #   10-19 secs      # => less than 20 seconds
      #   20-39 secs      # => half a minute
      #   40-59 secs      # => less than a minute
      #   60-89 secs      # => 1 minute
      #
      # ==== Examples
      #   from_time = Time.now
      #   distance_of_time_in_words(from_time, from_time + 50.minutes)        # => about 1 hour
      #   distance_of_time_in_words(from_time, 50.minutes.from_now)           # => about 1 hour
      #   distance_of_time_in_words(from_time, from_time + 15.seconds)        # => less than a minute
      #   distance_of_time_in_words(from_time, from_time + 15.seconds, true)  # => less than 20 seconds
      #   distance_of_time_in_words(from_time, 3.years.from_now)              # => over 3 years
      #   distance_of_time_in_words(from_time, from_time + 60.hours)          # => about 3 days
      #   distance_of_time_in_words(from_time, from_time + 45.seconds, true)  # => less than a minute
      #   distance_of_time_in_words(from_time, from_time - 45.seconds, true)  # => less than a minute
      #   distance_of_time_in_words(from_time, 76.seconds.from_now)           # => 1 minute
      #   distance_of_time_in_words(from_time, from_time + 1.year + 3.days)   # => about 1 year
      #   distance_of_time_in_words(from_time, from_time + 4.years + 15.days + 30.minutes + 5.seconds) # => over 4 years
      #
      #   to_time = Time.now + 6.years + 19.days
      #   distance_of_time_in_words(from_time, to_time, true)     # => over 6 years
      #   distance_of_time_in_words(to_time, from_time, true)     # => over 6 years
      #   distance_of_time_in_words(Time.now, Time.now)           # => less than a minute
      #
      def distance_of_time_in_words(from_time, to_time = 0, include_seconds = false, options = {})
        from_time = from_time.to_time if from_time.respond_to?(:to_time)
        to_time = to_time.to_time if to_time.respond_to?(:to_time)
        distance_in_minutes = (((to_time - from_time).abs)/60).round
        distance_in_seconds = ((to_time - from_time).abs).round

        I18n.with_options :locale => options[:locale], :scope => :'datetime.distance_in_words' do |locale|
          case distance_in_minutes
            when 0..1
              return distance_in_minutes == 0 ? 
                     locale.t(:less_than_x_minutes, :count => 1) :
                     locale.t(:x_minutes, :count => distance_in_minutes) unless include_seconds

              case distance_in_seconds
                when 0..4   then locale.t :less_than_x_seconds, :count => 5
                when 5..9   then locale.t :less_than_x_seconds, :count => 10
                when 10..19 then locale.t :less_than_x_seconds, :count => 20
                when 20..39 then locale.t :half_a_minute
                when 40..59 then locale.t :less_than_x_minutes, :count => 1
                else             locale.t :x_minutes,           :count => 1
              end

            when 2..44           then locale.t :x_minutes,      :count => distance_in_minutes
            when 45..89          then locale.t :about_x_hours,  :count => 1
            when 90..1439        then locale.t :about_x_hours,  :count => (distance_in_minutes.to_f / 60.0).round
            when 1440..2879      then locale.t :x_days,         :count => 1
            when 2880..43199     then locale.t :x_days,         :count => (distance_in_minutes / 1440).round
            when 43200..86399    then locale.t :about_x_months, :count => 1
            when 86400..525599   then locale.t :x_months,       :count => (distance_in_minutes / 43200).round
            when 525600..1051199 then locale.t :about_x_years,  :count => 1
            else                      locale.t :over_x_years,   :count => (distance_in_minutes / 525600).round
          end
        end
      end      

      # Like distance_of_time_in_words, but where <tt>to_time</tt> is fixed to <tt>Time.now</tt>.
      #
      # ==== Examples
      #   time_ago_in_words(3.minutes.from_now)       # => 3 minutes
      #   time_ago_in_words(Time.now - 15.hours)      # => 15 hours
      #   time_ago_in_words(Time.now)                 # => less than a minute
      #
      #   from_time = Time.now - 3.days - 14.minutes - 25.seconds     # => 3 days
      def time_ago_in_words(from_time, include_seconds = false)
        distance_of_time_in_words(from_time, Time.now, include_seconds)
      end

      alias_method :distance_of_time_in_words_to_now, :time_ago_in_words

      # Returns a set of select tags (one for year, month, and day) pre-selected for accessing a specified date-based attribute (identified by
      # +method+) on an object assigned to the template (identified by +object+). It's possible to tailor the selects through the +options+ hash,
      # which accepts all the keys that each of the individual select builders do (like <tt>:use_month_numbers</tt> for select_month) as well as a range of
      # discard options. The discard options are <tt>:discard_year</tt>, <tt>:discard_month</tt> and <tt>:discard_day</tt>. Set to true, they'll
      # drop the respective select. Discarding the month select will also automatically discard the day select. It's also possible to explicitly
      # set the order of the tags using the <tt>:order</tt> option with an array of symbols <tt>:year</tt>, <tt>:month</tt> and <tt>:day</tt> in
      # the desired order. Symbols may be omitted and the respective select is not included.
      #
      # Pass the <tt>:default</tt> option to set the default date. Use a Time object or a Hash of <tt>:year</tt>, <tt>:month</tt>, <tt>:day</tt>, <tt>:hour</tt>, <tt>:minute</tt>, and <tt>:second</tt>.
      #
      # Passing <tt>:disabled => true</tt> as part of the +options+ will make elements inaccessible for change.
      #
      # If anything is passed in the +html_options+ hash it will be applied to every select tag in the set.
      #
      # NOTE: Discarded selects will default to 1. So if no month select is available, January will be assumed.
      #
      # ==== Examples
      #   # Generates a date select that when POSTed is stored in the post variable, in the written_on attribute
      #   date_select("post", "written_on")
      #
      #   # Generates a date select that when POSTed is stored in the post variable, in the written_on attribute,
      #   # with the year in the year drop down box starting at 1995.
      #   date_select("post", "written_on", :start_year => 1995)
      #
      #   # Generates a date select that when POSTed is stored in the post variable, in the written_on attribute,
      #   # with the year in the year drop down box starting at 1995, numbers used for months instead of words,
      #   # and without a day select box. 
      #   date_select("post", "written_on", :start_year => 1995, :use_month_numbers => true,
      #                                     :discard_day => true, :include_blank => true)
      #
      #   # Generates a date select that when POSTed is stored in the post variable, in the written_on attribute
      #   # with the fields ordered as day, month, year rather than month, day, year.
      #   date_select("post", "written_on", :order => [:day, :month, :year])
      #
      #   # Generates a date select that when POSTed is stored in the user variable, in the birthday attribute
      #   # lacking a year field.
      #   date_select("user", "birthday", :order => [:month, :day])
      #
      #   # Generates a date select that when POSTed is stored in the user variable, in the birthday attribute
      #   # which is initially set to the date 3 days from the current date
      #   date_select("post", "written_on", :default => 3.days.from_now)
      #
      #   # Generates a date select that when POSTed is stored in the credit_card variable, in the bill_due attribute
      #   # that will have a default day of 20.
      #   date_select("credit_card", "bill_due", :default => { :day => 20 })
      #
      # The selects are prepared for multi-parameter assignment to an Active Record object.
      #
      # Note: If the day is not included as an option but the month is, the day will be set to the 1st to ensure that all month
      # choices are valid.
      def date_select(object_name, method, options = {}, html_options = {})
        InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_date_select_tag(options, html_options)
      end

      # Returns a set of select tags (one for hour, minute and optionally second) pre-selected for accessing a specified
      # time-based attribute (identified by +method+) on an object assigned to the template (identified by +object+).
      # You can include the seconds with <tt>:include_seconds</tt>.
      # 
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      # ==== Examples
      #   # Creates a time select tag that, when POSTed, will be stored in the post variable in the sunrise attribute
      #   time_select("post", "sunrise")
      #
      #   # Creates a time select tag that, when POSTed, will be stored in the order variable in the submitted attribute
      #   time_select("order", "submitted")
      #
      #   # Creates a time select tag that, when POSTed, will be stored in the mail variable in the sent_at attribute
      #   time_select("mail", "sent_at")
      #
      #   # Creates a time select tag with a seconds field that, when POSTed, will be stored in the post variables in 
      #   # the sunrise attribute. 
      #   time_select("post", "start_time", :include_seconds => true)
      #
      #   # Creates a time select tag with a seconds field that, when POSTed, will be stored in the entry variables in 
      #   # the submission_time attribute. 
      #   time_select("entry", "submission_time", :include_seconds => true)
      #
      #   # You can set the :minute_step to 15 which will give you: 00, 15, 30 and 45.
      #   time_select 'game', 'game_time', {:minute_step => 15}
      #
      # The selects are prepared for multi-parameter assignment to an Active Record object.
      #
      # Note: If the day is not included as an option but the month is, the day will be set to the 1st to ensure that all month
      # choices are valid.
      def time_select(object_name, method, options = {}, html_options = {})
        InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_time_select_tag(options, html_options)
      end

      # Returns a set of select tags (one for year, month, day, hour, and minute) pre-selected for accessing a specified datetime-based
      # attribute (identified by +method+) on an object assigned to the template (identified by +object+). Examples:
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      # ==== Examples
      #   # Generates a datetime select that, when POSTed, will be stored in the post variable in the written_on attribute
      #   datetime_select("post", "written_on")
      #
      #   # Generates a datetime select with a year select that starts at 1995 that, when POSTed, will be stored in the 
      #   # post variable in the written_on attribute.
      #   datetime_select("post", "written_on", :start_year => 1995)
      #
      #   # Generates a datetime select with a default value of 3 days from the current time that, when POSTed, will be stored in the 
      #   # trip variable in the departing attribute.
      #   datetime_select("trip", "departing", :default => 3.days.from_now)
      #
      #   # Generates a datetime select that discards the type that, when POSTed, will be stored in the post variable as the written_on
      #   # attribute.
      #   datetime_select("post", "written_on", :discard_type => true)
      #
      # The selects are prepared for multi-parameter assignment to an Active Record object.
      def datetime_select(object_name, method, options = {}, html_options = {})
        InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_datetime_select_tag(options, html_options)
      end

      # Returns a set of html select-tags (one for year, month, day, hour, and minute) pre-selected with the +datetime+.
      # It's also possible to explicitly set the order of the tags using the <tt>:order</tt> option with an array of
      # symbols <tt>:year</tt>, <tt>:month</tt> and <tt>:day</tt> in the desired order. If you do not supply a Symbol, it
      # will be appended onto the <tt>:order</tt> passed in. You can also add <tt>:date_separator</tt> and <tt>:time_separator</tt>
      # keys to the +options+ to control visual display of the elements.
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      # ==== Examples
      #   my_date_time = Time.now + 4.days
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   select_datetime(my_date_time)
      #
      #   # Generates a datetime select that defaults to today (no specified datetime)
      #   select_datetime()
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   # with the fields ordered year, month, day rather than month, day, year.
      #   select_datetime(my_date_time, :order => [:year, :month, :day])
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   # with a '/' between each date field.
      #   select_datetime(my_date_time, :date_separator => '/')
      #
      #   # Generates a datetime select that discards the type of the field and defaults to the datetime in 
      #   # my_date_time (four days after today)
      #   select_datetime(my_date_time, :discard_type => true)
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   # prefixed with 'payday' rather than 'date'
      #   select_datetime(my_date_time, :prefix => 'payday')
      #
      def select_datetime(datetime = Time.current, options = {}, html_options = {})
        separator = options[:datetime_separator] || ''
        select_date(datetime, options, html_options) + separator + select_time(datetime, options, html_options)
       end

      # Returns a set of html select-tags (one for year, month, and day) pre-selected with the +date+.
      # It's possible to explicitly set the order of the tags using the <tt>:order</tt> option with an array of
      # symbols <tt>:year</tt>, <tt>:month</tt> and <tt>:day</tt> in the desired order. If you do not supply a Symbol, it
      # will be appended onto the <tt>:order</tt> passed in.
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      # ==== Examples
      #   my_date = Time.today + 6.days
      #
      #   # Generates a date select that defaults to the date in my_date (six days after today)
      #   select_date(my_date)
      #
      #   # Generates a date select that defaults to today (no specified date)
      #   select_date()
      #
      #   # Generates a date select that defaults to the date in my_date (six days after today)
      #   # with the fields ordered year, month, day rather than month, day, year.
      #   select_date(my_date, :order => [:year, :month, :day])
      #
      #   # Generates a date select that discards the type of the field and defaults to the date in 
      #   # my_date (six days after today)
      #   select_datetime(my_date_time, :discard_type => true)
      #
      #   # Generates a date select that defaults to the datetime in my_date (six days after today)
      #   # prefixed with 'payday' rather than 'date'
      #   select_datetime(my_date_time, :prefix => 'payday')
      #
      def select_date(date = Date.current, options = {}, html_options = {})
        options[:order] ||= []
        [:year, :month, :day].each { |o| options[:order].push(o) unless options[:order].include?(o) }

        select_date = ''
        options[:order].each do |o|
          select_date << self.send("select_#{o}", date, options, html_options)
        end
        select_date
      end

      # Returns a set of html select-tags (one for hour and minute)
      # You can set <tt>:time_separator</tt> key to format the output, and 
      # the <tt>:include_seconds</tt> option to include an input for seconds.
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      # ==== Examples
      #   my_time = Time.now + 5.days + 7.hours + 3.minutes + 14.seconds
      #
      #   # Generates a time select that defaults to the time in my_time
      #   select_time(my_time)
      #
      #   # Generates a time select that defaults to the current time (no specified time)
      #   select_time()
      #
      #   # Generates a time select that defaults to the time in my_time,
      #   # which has fields separated by ':' 
      #   select_time(my_time, :time_separator => ':')
      #
      #   # Generates a time select that defaults to the time in my_time,
      #   # that also includes an input for seconds
      #   select_time(my_time, :include_seconds => true)
      #
      #   # Generates a time select that defaults to the time in my_time, that has fields
      #   # separated by ':' and includes an input for seconds
      #   select_time(my_time, :time_separator => ':', :include_seconds => true)
      #
      def select_time(datetime = Time.current, options = {}, html_options = {})
        separator = options[:time_separator] || ''
        select_hour(datetime, options, html_options) + separator + select_minute(datetime, options, html_options) + (options[:include_seconds] ? separator + select_second(datetime, options, html_options) : '')
      end

      # Returns a select tag with options for each of the seconds 0 through 59 with the current second selected.
      # The <tt>second</tt> can also be substituted for a second number.
      # Override the field name using the <tt>:field_name</tt> option, 'second' by default.
      #
      # ==== Examples
      #   my_time = Time.now + 16.minutes
      #
      #   # Generates a select field for seconds that defaults to the seconds for the time in my_time
      #   select_second(my_time)
      #
      #   # Generates a select field for seconds that defaults to the number given
      #   select_second(33)
      # 
      #   # Generates a select field for seconds that defaults to the seconds for the time in my_time
      #   # that is named 'interval' rather than 'second'
      #   select_second(my_time, :field_name => 'interval')
      #
      def select_second(datetime, options = {}, html_options = {})
        val = datetime ? (datetime.kind_of?(Fixnum) ? datetime : datetime.sec) : ''
        if options[:use_hidden]
          options[:include_seconds] ? hidden_html(options[:field_name] || 'second', val, options) : ''
        else
          second_options = []
          0.upto(59) do |second|
            second_options << ((val == second) ?
              content_tag(:option, leading_zero_on_single_digits(second), :value => leading_zero_on_single_digits(second), :selected => "selected") :
              content_tag(:option, leading_zero_on_single_digits(second), :value => leading_zero_on_single_digits(second))
            )
            second_options << "\n"
          end
          select_html(options[:field_name] || 'second', second_options.join, options, html_options)
        end
      end

      # Returns a select tag with options for each of the minutes 0 through 59 with the current minute selected.
      # Also can return a select tag with options by <tt>minute_step</tt> from 0 through 59 with the 00 minute selected
      # The <tt>minute</tt> can also be substituted for a minute number.
      # Override the field name using the <tt>:field_name</tt> option, 'minute' by default.
      #
      # ==== Examples
      #   my_time = Time.now + 6.hours
      #
      #   # Generates a select field for minutes that defaults to the minutes for the time in my_time
      #   select_minute(my_time)
      #
      #   # Generates a select field for minutes that defaults to the number given
      #   select_minute(14)
      # 
      #   # Generates a select field for minutes that defaults to the minutes for the time in my_time
      #   # that is named 'stride' rather than 'second'
      #   select_minute(my_time, :field_name => 'stride')
      #
      def select_minute(datetime, options = {}, html_options = {})
        val = datetime ? (datetime.kind_of?(Fixnum) ? datetime : datetime.min) : ''
        if options[:use_hidden]
          hidden_html(options[:field_name] || 'minute', val, options)
        else
          minute_options = []
          0.step(59, options[:minute_step] || 1) do |minute|
            minute_options << ((val == minute) ?
              content_tag(:option, leading_zero_on_single_digits(minute), :value => leading_zero_on_single_digits(minute), :selected => "selected") :
              content_tag(:option, leading_zero_on_single_digits(minute), :value => leading_zero_on_single_digits(minute))
            )
            minute_options << "\n"
          end
          select_html(options[:field_name] || 'minute', minute_options.join, options, html_options)
         end
      end

      # Returns a select tag with options for each of the hours 0 through 23 with the current hour selected.
      # The <tt>hour</tt> can also be substituted for a hour number.
      # Override the field name using the <tt>:field_name</tt> option, 'hour' by default.
      #
      # ==== Examples
      #   my_time = Time.now + 6.hours
      #
      #   # Generates a select field for minutes that defaults to the minutes for the time in my_time
      #   select_minute(my_time)
      #
      #   # Generates a select field for minutes that defaults to the number given
      #   select_minute(14)
      # 
      #   # Generates a select field for minutes that defaults to the minutes for the time in my_time
      #   # that is named 'stride' rather than 'second'
      #   select_minute(my_time, :field_name => 'stride')
      #
      def select_hour(datetime, options = {}, html_options = {})
        val = datetime ? (datetime.kind_of?(Fixnum) ? datetime : datetime.hour) : ''
        if options[:use_hidden]
          hidden_html(options[:field_name] || 'hour', val, options)
        else
          hour_options = []
          0.upto(23) do |hour|
            hour_options << ((val == hour) ?
              content_tag(:option, leading_zero_on_single_digits(hour), :value => leading_zero_on_single_digits(hour), :selected => "selected") :
              content_tag(:option, leading_zero_on_single_digits(hour), :value => leading_zero_on_single_digits(hour))
            )
            hour_options << "\n"
          end
          select_html(options[:field_name] || 'hour', hour_options.join, options, html_options)
        end
      end

      # Returns a select tag with options for each of the days 1 through 31 with the current day selected.
      # The <tt>date</tt> can also be substituted for a hour number.
      # Override the field name using the <tt>:field_name</tt> option, 'day' by default.
      #
      # ==== Examples
      #   my_date = Time.today + 2.days
      #
      #   # Generates a select field for days that defaults to the day for the date in my_date
      #   select_day(my_time)
      #
      #   # Generates a select field for days that defaults to the number given
      #   select_day(5)
      # 
      #   # Generates a select field for days that defaults to the day for the date in my_date
      #   # that is named 'due' rather than 'day'
      #   select_day(my_time, :field_name => 'due')
      #
      def select_day(date, options = {}, html_options = {})
        val = date ? (date.kind_of?(Fixnum) ? date : date.day) : ''
        if options[:use_hidden]
          hidden_html(options[:field_name] || 'day', val, options)
        else
          day_options = []
          1.upto(31) do |day|
            day_options << ((val == day) ?
              content_tag(:option, day, :value => day, :selected => "selected") :
              content_tag(:option, day, :value => day)
            )
            day_options << "\n"
          end
          select_html(options[:field_name] || 'day', day_options.join, options, html_options)
        end
      end

      # Returns a select tag with options for each of the months January through December with the current month selected.
      # The month names are presented as keys (what's shown to the user) and the month numbers (1-12) are used as values
      # (what's submitted to the server). It's also possible to use month numbers for the presentation instead of names --
      # set the <tt>:use_month_numbers</tt> key in +options+ to true for this to happen. If you want both numbers and names,
      # set the <tt>:add_month_numbers</tt> key in +options+ to true. If you would prefer to show month names as abbreviations,
      # set the <tt>:use_short_month</tt> key in +options+ to true. If you want to use your own month names, set the
      # <tt>:use_month_names</tt> key in +options+ to an array of 12 month names. Override the field name using the 
      # <tt>:field_name</tt> option, 'month' by default.
      #
      # ==== Examples
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "January", "March".
      #   select_month(Date.today)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # is named "start" rather than "month"
      #   select_month(Date.today, :field_name => 'start')
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "1", "3".       
      #   select_month(Date.today, :use_month_numbers => true)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "1 - January", "3 - March".
      #   select_month(Date.today, :add_month_numbers => true)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "Jan", "Mar".
      #   select_month(Date.today, :use_short_month => true)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "Januar", "Marts."
      #   select_month(Date.today, :use_month_names => %w(Januar Februar Marts ...))
      #
      def select_month(date, options = {}, html_options = {})
        locale = options[:locale] 
        locale ||= self.locale if respond_to?(:locale)

        val = date ? (date.kind_of?(Fixnum) ? date : date.month) : ''
        if options[:use_hidden]
          hidden_html(options[:field_name] || 'month', val, options)
        else
          month_options = []
          month_names = options[:use_month_names] || begin
            key = options[:use_short_month] ? :'date.abbr_month_names' : :'date.month_names'
            I18n.translate key, locale
          end
          month_names.unshift(nil) if month_names.size < 13

          1.upto(12) do |month_number|
            month_name = if options[:use_month_numbers]
              month_number
            elsif options[:add_month_numbers]
              month_number.to_s + ' - ' + month_names[month_number]
            else
              month_names[month_number]
            end

            month_options << ((val == month_number) ?
              content_tag(:option, month_name, :value => month_number, :selected => "selected") :
              content_tag(:option, month_name, :value => month_number)
            )
            month_options << "\n"
          end
          select_html(options[:field_name] || 'month', month_options.join, options, html_options)
        end
      end      

      # Returns a select tag with options for each of the five years on each side of the current, which is selected. The five year radius
      # can be changed using the <tt>:start_year</tt> and <tt>:end_year</tt> keys in the +options+. Both ascending and descending year
      # lists are supported by making <tt>:start_year</tt> less than or greater than <tt>:end_year</tt>. The <tt>date</tt> can also be
      # substituted for a year given as a number.  Override the field name using the <tt>:field_name</tt> option, 'year' by default.
      #
      # ==== Examples
      #   # Generates a select field for years that defaults to the current year that
      #   # has ascending year values
      #   select_year(Date.today, :start_year => 1992, :end_year => 2007)
      #
      #   # Generates a select field for years that defaults to the current year that
      #   # is named 'birth' rather than 'year'
      #   select_year(Date.today, :field_name => 'birth')
      #
      #   # Generates a select field for years that defaults to the current year that
      #   # has descending year values
      #   select_year(Date.today, :start_year => 2005, :end_year => 1900)
      #
      #   # Generates a select field for years that defaults to the year 2006 that
      #   # has ascending year values
      #   select_year(2006, :start_year => 2000, :end_year => 2010)
      #
      def select_year(date, options = {}, html_options = {})
        val = date ? (date.kind_of?(Fixnum) ? date : date.year) : ''
        if options[:use_hidden]
          hidden_html(options[:field_name] || 'year', val, options)
        else
          year_options = []
          y = date ? (date.kind_of?(Fixnum) ? (y = (date == 0) ? Date.today.year : date) : date.year) : Date.today.year

          start_year, end_year = (options[:start_year] || y-5), (options[:end_year] || y+5)
          step_val = start_year < end_year ? 1 : -1
          start_year.step(end_year, step_val) do |year|
            year_options << ((val == year) ?
              content_tag(:option, year, :value => year, :selected => "selected") :
              content_tag(:option, year, :value => year)
            )
            year_options << "\n"
          end
          select_html(options[:field_name] || 'year', year_options.join, options, html_options)
        end
      end

      private

        def select_html(type, html_options, options, select_tag_options = {})
          name_and_id_from_options(options, type)
          select_options = {:id => options[:id], :name => options[:name]}
          select_options.merge!(:disabled => 'disabled') if options[:disabled]
          select_options.merge!(select_tag_options) unless select_tag_options.empty?
          select_html = "\n"
          select_html << content_tag(:option, '', :value => '') + "\n" if options[:include_blank]
          select_html << html_options.to_s
          content_tag(:select, select_html, select_options) + "\n"
        end

        def hidden_html(type, value, options)
          name_and_id_from_options(options, type)
          hidden_html = tag(:input, :type => "hidden", :id => options[:id], :name => options[:name], :value => value) + "\n"
        end

        def name_and_id_from_options(options, type)
          options[:name] = (options[:prefix] || DEFAULT_PREFIX) + (options[:discard_type] ? '' : "[#{type}]")
          options[:id] = options[:name].gsub(/([\[\(])|(\]\[)/, '_').gsub(/[\]\)]/, '')
        end

        def leading_zero_on_single_digits(number)
          number > 9 ? number : "0#{number}"
        end
    end

    class InstanceTag #:nodoc:
      include DateHelper

      def to_date_select_tag(options = {}, html_options = {})
        date_or_time_select(options.merge(:discard_hour => true), html_options)
      end

      def to_time_select_tag(options = {}, html_options = {})
        date_or_time_select(options.merge(:discard_year => true, :discard_month => true), html_options)
      end

      def to_datetime_select_tag(options = {}, html_options = {})
        date_or_time_select(options, html_options)
      end

      private
        def date_or_time_select(options, html_options = {})
          locale = options[:locale]

          defaults = { :discard_type => true }
          options  = defaults.merge(options)
          datetime = value(object)
          datetime ||= default_time_from_options(options[:default]) unless options[:include_blank]
    
          position = { :year => 1, :month => 2, :day => 3, :hour => 4, :minute => 5, :second => 6 }

          order = options[:order] ||= I18n.translate(:'date.order', locale)
    
          # Discard explicit and implicit by not being included in the :order
          discard = {}
          discard[:year]   = true if options[:discard_year] or !order.include?(:year)
          discard[:month]  = true if options[:discard_month] or !order.include?(:month)
          discard[:day]    = true if options[:discard_day] or discard[:month] or !order.include?(:day)
          discard[:hour]   = true if options[:discard_hour]
          discard[:minute] = true if options[:discard_minute] or discard[:hour]
          discard[:second] = true unless options[:include_seconds] && !discard[:minute]
    
          # If the day is hidden and the month is visible, the day should be set to the 1st so all month choices are valid
          # (otherwise it could be 31 and february wouldn't be a valid date)
          if datetime && discard[:day] && !discard[:month]
            datetime = datetime.change(:day => 1)
          end
    
          # Maintain valid dates by including hidden fields for discarded elements
          [:day, :month, :year].each { |o| order.unshift(o) unless order.include?(o) }
    
          # Ensure proper ordering of :hour, :minute and :second
          [:hour, :minute, :second].each { |o| order.delete(o); order.push(o) }
    
          date_or_time_select = ''
          order.reverse.each do |param|
            # Send hidden fields for discarded elements once output has started
            # This ensures AR can reconstruct valid dates using ParseDate
            next if discard[param] && date_or_time_select.empty?

            date_or_time_select.insert(0, self.send("select_#{param}", datetime, options_with_prefix(position[param], options.merge(:use_hidden => discard[param])), html_options))
            date_or_time_select.insert(0,
              case param
                when :hour then (discard[:year] && discard[:day] ? "" : " &mdash; ")
                when :minute then " : "
                when :second then options[:include_seconds] ? " : " : ""
                else ""
              end)
          end
    
          date_or_time_select
        end

        def options_with_prefix(position, options)
          prefix = "#{@object_name}"
          if options[:index]
            prefix << "[#{options[:index]}]"
          elsif @auto_index
            prefix << "[#{@auto_index}]"
          end
          options.merge(:prefix => "#{prefix}[#{@method_name}(#{position}i)]")
        end

        def default_time_from_options(default)
          case default
            when nil
              Time.current
            when Date, Time
              default
            else
              # Rename :minute and :second to :min and :sec
              default[:min] ||= default[:minute]
              default[:sec] ||= default[:second]

              time = Time.current
                
              [:year, :month, :day, :hour, :min, :sec].each do |key|
                default[key] ||= time.send(key)
              end

              Time.utc_time(default[:year], default[:month], default[:day], default[:hour], default[:min], default[:sec])
            end
        end
    end

    class FormBuilder
      def date_select(method, options = {}, html_options = {})
        @template.date_select(@object_name, method, options.merge(:object => @object))
      end

      def time_select(method, options = {}, html_options = {})
        @template.time_select(@object_name, method, options.merge(:object => @object))
      end

      def datetime_select(method, options = {}, html_options = {})
        @template.datetime_select(@object_name, method, options.merge(:object => @object))
      end
    end
  end
end