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
|
require 'rational'
module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module DateTime #:nodoc:
# Enables the use of time calculations within DateTime itself
module Calculations
# Seconds since midnight: DateTime.now.seconds_since_midnight
def seconds_since_midnight
self.sec + (self.min * 60) + (self.hour * 3600)
end
# Returns a new DateTime where one or more of the elements have been changed according to the +options+ parameter. The time options
# (hour, minute, sec) 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.
def change(options)
::DateTime.civil(
options[:year] || self.year,
options[:month] || self.month,
options[:mday] || self.mday,
options[:hour] || self.hour,
options[:min] || (options[:hour] ? 0 : self.min),
options[:sec] || ((options[:hour] || options[:min]) ? 0 : self.sec),
options[:offset] || self.offset,
options[:start] || self.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: :months, :days, :years.
def advance(options)
d = ::Date.new(year + (options.delete(:years) || 0), month, day)
d = d >> options.delete(:months) if options[:months]
d = d + options.delete(:days) if options[:days]
change(options.merge(:year => d.year, :month => d.month, :mday => d.day))
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)
self.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, 86400)
end
alias :in :since
# Returns a new DateTime representing the time a number of specified months ago
def months_ago(months)
months_since(-months)
end
def months_since(months)
year, month, mday = self.year, self.month, self.mday
month += months
# in case months is negative
while month < 1
month += 12
year -= 1
end
# in case months is positive
while month > 12
month -= 12
year += 1
end
max = ::Time.days_in_month(month, year)
mday = max if mday > max
change(:year => year, :month => month, :mday => mday)
end
# Returns a new DateTime representing the time a number of specified years ago
def years_ago(years)
change(:year => self.year - years)
end
def years_since(years)
change(:year => self.year + years)
end
# Short-hand for years_ago(1)
def last_year
years_ago(1)
end
# Short-hand for years_since(1)
def next_year
years_since(1)
end
# Short-hand for months_ago(1)
def last_month
months_ago(1)
end
# Short-hand for months_since(1)
def next_month
months_since(1)
end
# Returns a new DateTime representing the "start" of this week (Monday, 0:00)
def beginning_of_week
days_to_monday = self.wday!=0 ? self.wday-1 : 6
(self - days_to_monday).midnight
end
alias :monday :beginning_of_week
alias :at_beginning_of_week :beginning_of_week
# Returns a new DateTime representing the start of the given day in next week (default is Monday).
def next_week(day = :monday)
days_into_week = { :monday => 0, :tuesday => 1, :wednesday => 2, :thursday => 3, :friday => 4, :saturday => 5, :sunday => 6}
((self + 7).beginning_of_week + days_into_week[day]).change(:hour => 0)
end
# 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 end of the day (23:59:59)
def end_of_day
change(:hour => 23, :min => 59, :sec => 59)
end
# Returns a new DateTime representing the start of the month (1st of the month, 0:00)
def beginning_of_month
change(:mday => 1,:hour => 0, :min => 0, :sec => 0)
end
alias :at_beginning_of_month :beginning_of_month
# Returns a new DateTime representing the end of the month (last day of the month, 0:00)
def end_of_month
last_day = ::Time.days_in_month( self.month, self.year )
change(:mday => last_day,:hour => 0, :min => 0, :sec => 0)
end
alias :at_end_of_month :end_of_month
# Returns a new DateTime representing the start of the quarter (1st of january, april, july, october, 0:00)
def beginning_of_quarter
beginning_of_month.change(:month => [10, 7, 4, 1].detect { |m| m <= self.month })
end
alias :at_beginning_of_quarter :beginning_of_quarter
# Returns a new DateTime representing the start of the year (1st of january, 0:00)
def beginning_of_year
change(:month => 1,:mday => 1,:hour => 0, :min => 0, :sec => 0)
end
alias :at_beginning_of_year :beginning_of_year
# Convenience method which returns a new DateTime representing the time 1 day ago
def yesterday
self - 1
end
# Convenience method which returns a new DateTime representing the time 1 day since the instance time
def tomorrow
self + 1
end
end
end
end
end
|