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
|
# frozen_string_literal: true
require "date"
class DateTime
class << self
# Returns <tt>Time.zone.now.to_datetime</tt> when <tt>Time.zone</tt> or
# <tt>config.time_zone</tt> are set, otherwise returns
# <tt>Time.now.to_datetime</tt>.
def current
::Time.zone ? ::Time.zone.now.to_datetime : ::Time.now.to_datetime
end
end
# Returns the number of seconds since 00:00:00.
#
# DateTime.new(2012, 8, 29, 0, 0, 0).seconds_since_midnight # => 0
# DateTime.new(2012, 8, 29, 12, 34, 56).seconds_since_midnight # => 45296
# DateTime.new(2012, 8, 29, 23, 59, 59).seconds_since_midnight # => 86399
def seconds_since_midnight
sec + (min * 60) + (hour * 3600)
end
# Returns the number of seconds until 23:59:59.
#
# DateTime.new(2012, 8, 29, 0, 0, 0).seconds_until_end_of_day # => 86399
# DateTime.new(2012, 8, 29, 12, 34, 56).seconds_until_end_of_day # => 41103
# DateTime.new(2012, 8, 29, 23, 59, 59).seconds_until_end_of_day # => 0
def seconds_until_end_of_day
end_of_day.to_i - to_i
end
# Returns the fraction of a second as a +Rational+
#
# DateTime.new(2012, 8, 29, 0, 0, 0.5).subsec # => (1/2)
def subsec
sec_fraction
end
# Returns a new DateTime where one or more of the elements have been changed
# according to the +options+ parameter. The time options (<tt>:hour</tt>,
# <tt>:min</tt>, <tt>:sec</tt>) reset cascadingly, so if only the hour is
# passed, then minute and sec is set to 0. If the hour and minute is passed,
# then sec is set to 0. The +options+ parameter takes a hash with any of these
# keys: <tt>:year</tt>, <tt>:month</tt>, <tt>:day</tt>, <tt>:hour</tt>,
# <tt>:min</tt>, <tt>:sec</tt>, <tt>:offset</tt>, <tt>:start</tt>.
#
# DateTime.new(2012, 8, 29, 22, 35, 0).change(day: 1) # => DateTime.new(2012, 8, 1, 22, 35, 0)
# DateTime.new(2012, 8, 29, 22, 35, 0).change(year: 1981, day: 1) # => DateTime.new(1981, 8, 1, 22, 35, 0)
# DateTime.new(2012, 8, 29, 22, 35, 0).change(year: 1981, hour: 0) # => DateTime.new(1981, 8, 29, 0, 0, 0)
def change(options)
if new_nsec = options[:nsec]
raise ArgumentError, "Can't change both :nsec and :usec at the same time: #{options.inspect}" if options[:usec]
new_fraction = Rational(new_nsec, 1000000000)
else
new_usec = options.fetch(:usec, (options[:hour] || options[:min] || options[:sec]) ? 0 : Rational(nsec, 1000))
new_fraction = Rational(new_usec, 1000000)
end
raise ArgumentError, "argument out of range" if new_fraction >= 1
::DateTime.civil(
options.fetch(:year, year),
options.fetch(:month, month),
options.fetch(:day, day),
options.fetch(:hour, hour),
options.fetch(:min, options[:hour] ? 0 : min),
options.fetch(:sec, (options[:hour] || options[:min]) ? 0 : sec) + new_fraction,
options.fetch(:offset, offset),
options.fetch(:start, start)
)
end
# Uses Date to provide precise Time calculations for years, months, and days.
# The +options+ parameter takes a hash with any of these keys: <tt>:years</tt>,
# <tt>:months</tt>, <tt>:weeks</tt>, <tt>:days</tt>, <tt>:hours</tt>,
# <tt>:minutes</tt>, <tt>:seconds</tt>.
def advance(options)
unless options[:weeks].nil?
options[:weeks], partial_weeks = options[:weeks].divmod(1)
options[:days] = options.fetch(:days, 0) + 7 * partial_weeks
end
unless options[:days].nil?
options[:days], partial_days = options[:days].divmod(1)
options[:hours] = options.fetch(:hours, 0) + 24 * partial_days
end
d = to_date.advance(options)
datetime_advanced_by_date = change(year: d.year, month: d.month, day: d.day)
seconds_to_advance = \
options.fetch(:seconds, 0) +
options.fetch(:minutes, 0) * 60 +
options.fetch(:hours, 0) * 3600
if seconds_to_advance.zero?
datetime_advanced_by_date
else
datetime_advanced_by_date.since(seconds_to_advance)
end
end
# Returns a new DateTime representing the time a number of seconds ago.
# Do not use this method in combination with x.months, use months_ago instead!
def ago(seconds)
since(-seconds)
end
# Returns a new DateTime representing the time a number of seconds since the
# instance time. Do not use this method in combination with x.months, use
# months_since instead!
def since(seconds)
self + Rational(seconds.round, 86400)
end
alias :in :since
# Returns a new DateTime representing the start of the day (0:00).
def beginning_of_day
change(hour: 0)
end
alias :midnight :beginning_of_day
alias :at_midnight :beginning_of_day
alias :at_beginning_of_day :beginning_of_day
# Returns a new DateTime representing the middle of the day (12:00)
def middle_of_day
change(hour: 12)
end
alias :midday :middle_of_day
alias :noon :middle_of_day
alias :at_midday :middle_of_day
alias :at_noon :middle_of_day
alias :at_middle_of_day :middle_of_day
# Returns a new DateTime representing the end of the day (23:59:59).
def end_of_day
change(hour: 23, min: 59, sec: 59, usec: Rational(999999999, 1000))
end
alias :at_end_of_day :end_of_day
# Returns a new DateTime representing the start of the hour (hh:00:00).
def beginning_of_hour
change(min: 0)
end
alias :at_beginning_of_hour :beginning_of_hour
# Returns a new DateTime representing the end of the hour (hh:59:59).
def end_of_hour
change(min: 59, sec: 59, usec: Rational(999999999, 1000))
end
alias :at_end_of_hour :end_of_hour
# Returns a new DateTime representing the start of the minute (hh:mm:00).
def beginning_of_minute
change(sec: 0)
end
alias :at_beginning_of_minute :beginning_of_minute
# Returns a new DateTime representing the end of the minute (hh:mm:59).
def end_of_minute
change(sec: 59, usec: Rational(999999999, 1000))
end
alias :at_end_of_minute :end_of_minute
# Returns a <tt>Time</tt> instance of the simultaneous time in the system timezone.
def localtime(utc_offset = nil)
utc = new_offset(0)
Time.utc(
utc.year, utc.month, utc.day,
utc.hour, utc.min, utc.sec + utc.sec_fraction
).getlocal(utc_offset)
end
alias_method :getlocal, :localtime
# Returns a <tt>Time</tt> instance of the simultaneous time in the UTC timezone.
#
# DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-6, 24)) # => Mon, 21 Feb 2005 10:11:12 -0600
# DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-6, 24)).utc # => Mon, 21 Feb 2005 16:11:12 UTC
def utc
utc = new_offset(0)
Time.utc(
utc.year, utc.month, utc.day,
utc.hour, utc.min, utc.sec + utc.sec_fraction
)
end
alias_method :getgm, :utc
alias_method :getutc, :utc
alias_method :gmtime, :utc
# Returns +true+ if <tt>offset == 0</tt>.
def utc?
offset == 0
end
# Returns the offset value in seconds.
def utc_offset
(offset * 86400).to_i
end
# Layers additional behavior on DateTime#<=> so that Time and
# ActiveSupport::TimeWithZone instances can be compared with a DateTime.
def <=>(other)
if other.respond_to? :to_datetime
super other.to_datetime rescue nil
else
super
end
end
end
|