Module: DateAndTime::Calculations

Included in:
Date, Time
Defined in:
activesupport/lib/active_support/core_ext/date_and_time/calculations.rb

Constant Summary collapse

DAYS_INTO_WEEK = 
{
  sunday: 0,
  monday: 1,
  tuesday: 2,
  wednesday: 3,
  thursday: 4,
  friday: 5,
  saturday: 6
}
WEEKEND_DAYS = 
[ 6, 0 ]

Instance Method Summary collapse

Instance Method Details

#after?(date_or_time) ⇒ Boolean

Returns true if the date/time falls after date_or_time.

Returns:

  • (Boolean) 


72
73
74
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 72

def after?(date_or_time)
  self > date_or_time
end

#all_day ⇒ Object

Returns a Range representing the whole day of the current date/time.



310
311
312
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 310

def all_day
  beginning_of_day..end_of_day
end

#all_month ⇒ Object

Returns a Range representing the whole month of the current date/time.



321
322
323
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 321

def all_month
  beginning_of_month..end_of_month
end

#all_quarter ⇒ Object

Returns a Range representing the whole quarter of the current date/time.



326
327
328
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 326

def all_quarter
  beginning_of_quarter..end_of_quarter
end

#all_week(start_day = Date.beginning_of_week) ⇒ Object

Returns a Range representing the whole week of the current date/time. Week starts on start_day, default is Date.beginning_of_week or config.beginning_of_week when set.



316
317
318
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 316

def all_week(start_day = Date.beginning_of_week)
  beginning_of_week(start_day)..end_of_week(start_day)
end

#all_year ⇒ Object

Returns a Range representing the whole year of the current date/time.



331
332
333
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 331

def all_year
  beginning_of_year..end_of_year
end

#before?(date_or_time) ⇒ Boolean

Returns true if the date/time falls before date_or_time.

Returns:

  • (Boolean) 


67
68
69
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 67

def before?(date_or_time)
  self < date_or_time
end

#beginning_of_month ⇒ Object Also known as: at_beginning_of_month

Returns a new date/time at the start of the month.

today = Date.today # => Thu, 18 Jun 2015
today.beginning_of_month # => Mon, 01 Jun 2015

DateTime objects will have a time set to 0:00.

now = DateTime.current # => Thu, 18 Jun 2015 15:23:13 +0000
now.beginning_of_month # => Mon, 01 Jun 2015 00:00:00 +0000



125
126
127
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 125

def beginning_of_month
  first_hour(change(day: 1))
end

#beginning_of_quarter ⇒ Object Also known as: at_beginning_of_quarter

Returns a new date/time at the start of the quarter.

today = Date.today # => Fri, 10 Jul 2015
today.beginning_of_quarter # => Wed, 01 Jul 2015

DateTime objects will have a time set to 0:00.

now = DateTime.current # => Fri, 10 Jul 2015 18:41:29 +0000
now.beginning_of_quarter # => Wed, 01 Jul 2015 00:00:00 +0000



139
140
141
142
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 139

def beginning_of_quarter
  first_quarter_month = month - (2 + month) % 3
  beginning_of_month.change(month: first_quarter_month)
end

#beginning_of_week(start_day = Date.beginning_of_week) ⇒ Object Also known as: at_beginning_of_week

Returns a new date/time representing the start of this week on the given day. Week is assumed to start on start_day, default is Date.beginning_of_week or config.beginning_of_week when set. DateTime objects have their time set to 0:00.



267
268
269
270
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 267

def beginning_of_week(start_day = Date.beginning_of_week)
  result = days_ago(days_to_week_start(start_day))
  acts_like?(:time) ? result.midnight : result
end

#beginning_of_year ⇒ Object Also known as: at_beginning_of_year

Returns a new date/time at the beginning of the year.

today = Date.today # => Fri, 10 Jul 2015
today.beginning_of_year # => Thu, 01 Jan 2015

DateTime objects will have a time set to 0:00.

now = DateTime.current # => Fri, 10 Jul 2015 18:41:29 +0000
now.beginning_of_year # => Thu, 01 Jan 2015 00:00:00 +0000



179
180
181
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 179

def beginning_of_year
  change(month: 1).beginning_of_month
end

#days_ago(days) ⇒ Object

Returns a new date/time the specified number of days ago.



77
78
79
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 77

def days_ago(days)
  advance(days: -days)
end

#days_since(days) ⇒ Object

Returns a new date/time the specified number of days in the future.



82
83
84
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 82

def days_since(days)
  advance(days: days)
end

#days_to_week_start(start_day = Date.beginning_of_week) ⇒ Object

Returns the number of days to the start of the week on the given day. Week is assumed to start on start_day, default is Date.beginning_of_week or config.beginning_of_week when set.



258
259
260
261
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 258

def days_to_week_start(start_day = Date.beginning_of_week)
  start_day_number = DAYS_INTO_WEEK.fetch(start_day)
  (wday - start_day_number) % 7
end

#end_of_month ⇒ Object Also known as: at_end_of_month

Returns a new date/time representing the end of the month. DateTime objects will have a time set to 23:59:59.



296
297
298
299
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 296

def end_of_month
  last_day = ::Time.days_in_month(month, year)
  last_hour(days_since(last_day - day))
end

#end_of_quarter ⇒ Object Also known as: at_end_of_quarter

Returns a new date/time at the end of the quarter.

today = Date.today # => Fri, 10 Jul 2015
today.end_of_quarter # => Wed, 30 Sep 2015

DateTime objects will have a time set to 23:59:59.

now = DateTime.current # => Fri, 10 Jul 2015 18:41:29 +0000
now.end_of_quarter # => Wed, 30 Sep 2015 23:59:59 +0000



154
155
156
157
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 154

def end_of_quarter
  last_quarter_month = month + (12 - month) % 3
  beginning_of_month.change(month: last_quarter_month).end_of_month
end

#end_of_week(start_day = Date.beginning_of_week) ⇒ Object Also known as: at_end_of_week

Returns a new date/time representing the end of this week on the given day. Week is assumed to start on start_day, default is Date.beginning_of_week or config.beginning_of_week when set. DateTime objects have their time set to 23:59:59.



283
284
285
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 283

def end_of_week(start_day = Date.beginning_of_week)
  last_hour(days_since(6 - days_to_week_start(start_day)))
end

#end_of_year ⇒ Object Also known as: at_end_of_year

Returns a new date/time representing the end of the year. DateTime objects will have a time set to 23:59:59.



304
305
306
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 304

def end_of_year
  change(month: 12).end_of_month
end

#future? ⇒ Boolean

Returns true if the date/time is in the future.

Returns:

  • (Boolean) 


52
53
54
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 52

def future?
  self > self.class.current
end

#last_month ⇒ Object

Short-hand for months_ago(1).



240
241
242
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 240

def last_month
  months_ago(1)
end

#last_year ⇒ Object

Short-hand for years_ago(1).



251
252
253
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 251

def last_year
  years_ago(1)
end

#monday ⇒ Object

Returns Monday of this week assuming that week starts on Monday. DateTime objects have their time set to 0:00.



275
276
277
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 275

def monday
  beginning_of_week(:monday)
end

#months_ago(months) ⇒ Object

Returns a new date/time the specified number of months ago.



97
98
99
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 97

def months_ago(months)
  advance(months: -months)
end

#months_since(months) ⇒ Object

Returns a new date/time the specified number of months in the future.



102
103
104
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 102

def months_since(months)
  advance(months: months)
end

#next_occurring(day_of_week) ⇒ Object

Returns a new date/time representing the next occurrence of the specified day of week.

today = Date.today               # => Thu, 14 Dec 2017
today.next_occurring(:monday)    # => Mon, 18 Dec 2017
today.next_occurring(:thursday)  # => Thu, 21 Dec 2017



340
341
342
343
344
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 340

def next_occurring(day_of_week)
  from_now = DAYS_INTO_WEEK.fetch(day_of_week) - wday
  from_now += 7 unless from_now > 0
  advance(days: from_now)
end

#next_quarter ⇒ Object

Short-hand for months_since(3).



215
216
217
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 215

def next_quarter
  months_since(3)
end

#next_week(given_day_in_next_week = Date.beginning_of_week, same_time: false) ⇒ Object

Returns a new date/time representing the given day in the next week.

today = Date.today # => Thu, 07 May 2015
today.next_week    # => Mon, 11 May 2015

The given_day_in_next_week defaults to the beginning of the week which is determined by Date.beginning_of_week or config.beginning_of_week when set.

today = Date.today       # => Thu, 07 May 2015
today.next_week(:friday) # => Fri, 15 May 2015

DateTime objects have their time set to 0:00 unless same_time is true.

now = DateTime.current # => Thu, 07 May 2015 13:31:16 +0000
now.next_week      # => Mon, 11 May 2015 00:00:00 +0000



200
201
202
203
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 200

def next_week(given_day_in_next_week = Date.beginning_of_week, same_time: false)
  result = first_hour(weeks_since(1).beginning_of_week.days_since(days_span(given_day_in_next_week)))
  same_time ? copy_time_to(result) : result
end

#next_weekday ⇒ Object

Returns a new date/time representing the next weekday.



206
207
208
209
210
211
212
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 206

def next_weekday
  if next_day.on_weekend?
    next_week(:monday, same_time: true)
  else
    next_day
  end
end

#on_weekday? ⇒ Boolean

Returns true if the date/time does not fall on a Saturday or Sunday.

Returns:

  • (Boolean) 


62
63
64
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 62

def on_weekday?
  !WEEKEND_DAYS.include?(wday)
end

#on_weekend? ⇒ Boolean

Returns true if the date/time falls on a Saturday or Sunday.

Returns:

  • (Boolean) 


57
58
59
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 57

def on_weekend?
  WEEKEND_DAYS.include?(wday)
end

#past? ⇒ Boolean

Returns true if the date/time is in the past.

Returns:

  • (Boolean) 


47
48
49
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 47

def past?
  self < self.class.current
end

#prev_occurring(day_of_week) ⇒ Object

Returns a new date/time representing the previous occurrence of the specified day of week.

today = Date.today               # => Thu, 14 Dec 2017
today.prev_occurring(:monday)    # => Mon, 11 Dec 2017
today.prev_occurring(:thursday)  # => Thu, 07 Dec 2017



351
352
353
354
355
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 351

def prev_occurring(day_of_week)
  ago = wday - DAYS_INTO_WEEK.fetch(day_of_week)
  ago += 7 unless ago > 0
  advance(days: -ago)
end

#prev_quarter ⇒ Object Also known as: last_quarter

Short-hand for months_ago(3).



245
246
247
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 245

def prev_quarter
  months_ago(3)
end

#prev_week(start_day = Date.beginning_of_week, same_time: false) ⇒ Object Also known as: last_week

Returns a new date/time representing the given day in the previous week. Week is assumed to start on start_day, default is Date.beginning_of_week or config.beginning_of_week when set. DateTime objects have their time set to 0:00 unless same_time is true.



223
224
225
226
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 223

def prev_week(start_day = Date.beginning_of_week, same_time: false)
  result = first_hour(weeks_ago(1).beginning_of_week.days_since(days_span(start_day)))
  same_time ? copy_time_to(result) : result
end

#prev_weekday ⇒ Object Also known as: last_weekday

Returns a new date/time representing the previous weekday.



230
231
232
233
234
235
236
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 230

def prev_weekday
  if prev_day.on_weekend?
    copy_time_to(beginning_of_week(:friday))
  else
    prev_day
  end
end

#quarter ⇒ Object

Returns the quarter for a date/time.

Date.new(2010, 1, 31).quarter  # => 1
Date.new(2010, 4, 12).quarter  # => 2
Date.new(2010, 9, 15).quarter  # => 3
Date.new(2010, 12, 25).quarter # => 4



166
167
168
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 166

def quarter
  (month / 3.0).ceil
end

#sunday ⇒ Object

Returns Sunday of this week assuming that week starts on Monday. DateTime objects have their time set to 23:59:59.



290
291
292
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 290

def sunday
  end_of_week(:monday)
end

#today? ⇒ Boolean

Returns true if the date/time is today.

Returns:

  • (Boolean) 


30
31
32
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 30

def today?
  to_date == ::Date.current
end

#tomorrow ⇒ Object

Returns a new date/time representing tomorrow.



25
26
27
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 25

def tomorrow
  advance(days: 1)
end

#tomorrow? ⇒ Boolean Also known as: next_day?

Returns true if the date/time is tomorrow.

Returns:

  • (Boolean) 


35
36
37
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 35

def tomorrow?
  to_date == ::Date.current.tomorrow
end

#weeks_ago(weeks) ⇒ Object

Returns a new date/time the specified number of weeks ago.



87
88
89
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 87

def weeks_ago(weeks)
  advance(weeks: -weeks)
end

#weeks_since(weeks) ⇒ Object

Returns a new date/time the specified number of weeks in the future.



92
93
94
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 92

def weeks_since(weeks)
  advance(weeks: weeks)
end

#years_ago(years) ⇒ Object

Returns a new date/time the specified number of years ago.



107
108
109
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 107

def years_ago(years)
  advance(years: -years)
end

#years_since(years) ⇒ Object

Returns a new date/time the specified number of years in the future.



112
113
114
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 112

def years_since(years)
  advance(years: years)
end

#yesterday ⇒ Object

Returns a new date/time representing yesterday.



20
21
22
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 20

def yesterday
  advance(days: -1)
end

#yesterday? ⇒ Boolean Also known as: prev_day?

Returns true if the date/time is yesterday.

Returns:

  • (Boolean) 


41
42
43
 
# File 'activesupport/lib/active_support/core_ext/date_and_time/calculations.rb', line 41

def yesterday?
  to_date == ::Date.current.yesterday
end