Enables the use of time calculations within DateTime itself

Namespace
Methods
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Instance Public methods
advance(options)

Uses Date to provide precise Time calculations for years, months, and days. The optionsparameter takes a hash with any of these keys: :years, :months, :weeks, :days, :hours, :minutes, :seconds.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 63
def advance(options)
  d = to_date.advance(options)
  datetime_advanced_by_date = change(:year => d.year, :month => d.month, :day => d.day)
  seconds_to_advance = (options[:seconds] || 0) + (options[:minutes] || 0) * 60 + (options[:hours] || 0) * 3600
  seconds_to_advance == 0 ? datetime_advanced_by_date : datetime_advanced_by_date.since(seconds_to_advance)
end
ago(seconds)

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!

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 72
def ago(seconds)
  self.since(-seconds)
end
at_beginning_of_day()
at_midnight()
beginning_of_day()

Returns a new DateTime representing the start of the day (0:00)

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 84
def beginning_of_day
  change(:hour => 0)
end
change(options)

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.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 46
def change(options)
  ::DateTime.civil(
    options[:year]  || self.year,
    options[:month] || self.month,
    options[:day]   || self.day,
    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
compare_with_coercion(other)

Layers additional behavior on DateTime#<=> so that Time and ActiveSupport::TimeWithZone instances can be compared with a DateTime

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 118
def compare_with_coercion(other)
  other = other.comparable_time if other.respond_to?(:comparable_time)
  other = other.to_datetime unless other.acts_like?(:date)
  compare_without_coercion(other)
end
end_of_day()

Returns a new DateTime representing the end of the day (23:59:59)

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 92
def end_of_day
  change(:hour => 23, :min => 59, :sec => 59)
end
future?()

Tells whether the DateTime object's datetime lies in the future

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 34
def future?
  self > ::DateTime.current
end
getutc()
in(seconds)
midnight()
past?()

Tells whether the DateTime object's datetime lies in the past

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 29
def past?
  self < ::DateTime.current
end
seconds_since_midnight()

Seconds since midnight: DateTime.now.#seconds_since_midnight

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 39
def seconds_since_midnight
  self.sec + (self.min * 60) + (self.hour * 3600)
end
since(seconds)

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!

Also aliased as: in
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 78
def since(seconds)
  self + Rational(seconds.round, 86400)
end
utc()

Adjusts DateTime to UTC by adding its offset value; offset is set to 0

Example:

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 +0000
Also aliased as: getutc
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 102
def utc
  new_offset(0)
end
utc?()

Returns true if offset == 0

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 108
def utc?
  offset == 0
end
utc_offset()

Returns the offset value in seconds

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 113
def utc_offset
  (offset * 86400).to_i
end