class Time

Parent:
Object
Included modules:
DateAndTime::Calculations, DateAndTime::Compatibility, DateAndTime::Zones

Constants

COMMON_YEAR_DAYS_IN_MONTH
DATE_FORMATS

Attributes

zone_default[RW]

Public Class Methods

===(other) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 17
def ===(other)
  super || (self == Time && other.is_a?(ActiveSupport::TimeWithZone))
end

Overriding case equality method so that it returns true for ActiveSupport::TimeWithZone instances

Calls superclass method
at(*args)
Also aliased as: at_without_coercion
Alias for: at_with_coercion
at_with_coercion(*args) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 44
def at_with_coercion(*args)
  return at_without_coercion(*args) if args.size != 1

  # Time.at can be called with a time or numerical value
  time_or_number = args.first

  if time_or_number.is_a?(ActiveSupport::TimeWithZone) || time_or_number.is_a?(DateTime)
    at_without_coercion(time_or_number.to_f).getlocal
  else
    at_without_coercion(time_or_number)
  end
end

Layers additional behavior on ::at so that ActiveSupport::TimeWithZone and DateTime instances can be used when called with a single argument

Also aliased as: at
at_without_coercion(*args)
Alias for: at
current() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 38
def current
  ::Time.zone ? ::Time.zone.now : ::Time.now
end

Returns Time.zone.now when Time.zone or config.time_zone are set, otherwise just returns Time.now.

days_in_month(month, year = current.year) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 23
def days_in_month(month, year = current.year)
  if month == 2 && ::Date.gregorian_leap?(year)
    29
  else
    COMMON_YEAR_DAYS_IN_MONTH[month]
  end
end

Returns the number of days in the given month. If no year is specified, it will use the current year.

days_in_year(year = current.year) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 33
def days_in_year(year = current.year)
  days_in_month(2, year) + 337
end

Returns the number of days in the given year. If no year is specified, it will use the current year.

find_zone(time_zone) Show source
# File activesupport/lib/active_support/core_ext/time/zones.rb, line 109
def find_zone(time_zone)
  find_zone!(time_zone) rescue nil
end

Returns a TimeZone instance matching the time zone provided. Accepts the time zone in any format supported by Time.zone=. Returns nil for invalid time zones.

Time.find_zone "America/New_York" # => #<ActiveSupport::TimeZone @name="America/New_York" ...>
Time.find_zone "NOT-A-TIMEZONE"   # => nil
find_zone!(time_zone) Show source
# File activesupport/lib/active_support/core_ext/time/zones.rb, line 82
def find_zone!(time_zone)
  if !time_zone || time_zone.is_a?(ActiveSupport::TimeZone)
    time_zone
  else
    # Look up the timezone based on the identifier (unless we've been
    # passed a TZInfo::Timezone)
    unless time_zone.respond_to?(:period_for_local)
      time_zone = ActiveSupport::TimeZone[time_zone] || TZInfo::Timezone.get(time_zone)
    end

    # Return if a TimeZone instance, or wrap in a TimeZone instance if a TZInfo::Timezone
    if time_zone.is_a?(ActiveSupport::TimeZone)
      time_zone
    else
      ActiveSupport::TimeZone.create(time_zone.name, nil, time_zone)
    end
  end
rescue TZInfo::InvalidTimezoneIdentifier
  raise ArgumentError, "Invalid Timezone: #{time_zone}"
end

Returns a TimeZone instance matching the time zone provided. Accepts the time zone in any format supported by Time.zone=. Raises an ArgumentError for invalid time zones.

Time.find_zone! "America/New_York" # => #<ActiveSupport::TimeZone @name="America/New_York" ...>
Time.find_zone! "EST"              # => #<ActiveSupport::TimeZone @name="EST" ...>
Time.find_zone! -5.hours           # => #<ActiveSupport::TimeZone @name="Bogota" ...>
Time.find_zone! nil                # => nil
Time.find_zone! false              # => false
Time.find_zone! "NOT-A-TIMEZONE"   # => ArgumentError: Invalid Timezone: NOT-A-TIMEZONE
rfc3339(str) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 66
def rfc3339(str)
  parts = Date._rfc3339(str)

  raise ArgumentError, "invalid date" if parts.empty?

  Time.new(
    parts.fetch(:year),
    parts.fetch(:mon),
    parts.fetch(:mday),
    parts.fetch(:hour),
    parts.fetch(:min),
    parts.fetch(:sec) + parts.fetch(:sec_fraction, 0),
    parts.fetch(:offset)
  )
end

Creates a Time instance from an RFC 3339 string.

Time.rfc3339('1999-12-31T14:00:00-10:00') # => 2000-01-01 00:00:00 -1000

If the time or offset components are missing then an ArgumentError will be raised.

Time.rfc3339('1999-12-31') # => ArgumentError: invalid date
use_zone(time_zone) { || ... } Show source
# File activesupport/lib/active_support/core_ext/time/zones.rb, line 62
def use_zone(time_zone)
  new_zone = find_zone!(time_zone)
  begin
    old_zone, ::Time.zone = ::Time.zone, new_zone
    yield
  ensure
    ::Time.zone = old_zone
  end
end

Allows override of Time.zone locally inside supplied block; resets Time.zone to existing value when done.

class ApplicationController < ActionController::Base
  around_action :set_time_zone

  private

  def set_time_zone
    Time.use_zone(current_user.timezone) { yield }
  end
end

NOTE: This won't affect any ActiveSupport::TimeWithZone objects that have already been created, e.g. any model timestamp attributes that have been read before the block will remain in the application's default timezone.

zone() Show source
# File activesupport/lib/active_support/core_ext/time/zones.rb, line 14
def zone
  Thread.current[:time_zone] || zone_default
end

Returns the TimeZone for the current request, if this has been set (via ::zone=). If Time.zone has not been set for the current request, returns the TimeZone specified in config.time_zone.

zone=(time_zone) Show source
# File activesupport/lib/active_support/core_ext/time/zones.rb, line 41
def zone=(time_zone)
  Thread.current[:time_zone] = find_zone!(time_zone)
end

Sets Time.zone to a TimeZone object for the current request/thread.

This method accepts any of the following:

  • A Rails TimeZone object.

  • An identifier for a Rails TimeZone object (e.g., “Eastern Time (US & Canada)”, -5.hours).

  • A TZInfo::Timezone object.

  • An identifier for a TZInfo::Timezone object (e.g., “America/New_York”).

Here's an example of how you might set Time.zone on a per request basis and reset it when the request is done. current_user.time_zone just needs to return a string identifying the user's preferred time zone:

class ApplicationController < ActionController::Base
  around_action :set_time_zone

  def set_time_zone
    if logged_in?
      Time.use_zone(current_user.time_zone) { yield }
    else
      yield
    end
  end
end

Public Instance Methods

-(other)
Alias for: minus_with_coercion
<=>(other)
Also aliased as: compare_without_coercion
acts_like_time?() Show source
# File activesupport/lib/active_support/core_ext/time/acts_like.rb, line 7
def acts_like_time?
  true
end

Duck-types as a Time-like class. See Object#acts_like?.

advance(options) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 162
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.gregorian.advance(options)
  time_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?
    time_advanced_by_date
  else
    time_advanced_by_date.since(seconds_to_advance)
  end
end

Uses Date to provide precise Time calculations for years, months, and days according to the proleptic Gregorian calendar. The options parameter takes a hash with any of these keys: :years, :months, :weeks, :days, :hours, :minutes, :seconds.

Time.new(2015, 8, 1, 14, 35, 0).advance(seconds: 1) # => 2015-08-01 14:35:01 -0700
Time.new(2015, 8, 1, 14, 35, 0).advance(minutes: 1) # => 2015-08-01 14:36:00 -0700
Time.new(2015, 8, 1, 14, 35, 0).advance(hours: 1)   # => 2015-08-01 15:35:00 -0700
Time.new(2015, 8, 1, 14, 35, 0).advance(days: 1)    # => 2015-08-02 14:35:00 -0700
Time.new(2015, 8, 1, 14, 35, 0).advance(weeks: 1)   # => 2015-08-08 14:35:00 -0700
ago(seconds) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 188
def ago(seconds)
  since(-seconds)
end

Returns a new Time representing the time a number of seconds ago, this is basically a wrapper around the Numeric extension

at_beginning_of_day()
Alias for: beginning_of_day
at_beginning_of_hour()
Alias for: beginning_of_hour
at_beginning_of_minute()
Alias for: beginning_of_minute
at_end_of_day()
Alias for: end_of_day
at_end_of_hour()
Alias for: end_of_hour
at_end_of_minute()
Alias for: end_of_minute
at_midday()
Alias for: middle_of_day
at_middle_of_day()
Alias for: middle_of_day
at_midnight()
Alias for: beginning_of_day
at_noon()
Alias for: middle_of_day
beginning_of_day() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 201
def beginning_of_day
  change(hour: 0)
end

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

beginning_of_hour() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 230
def beginning_of_hour
  change(min: 0)
end

Returns a new Time representing the start of the hour (x:00)

Also aliased as: at_beginning_of_hour
beginning_of_minute() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 246
def beginning_of_minute
  change(sec: 0)
end

Returns a new Time representing the start of the minute (x:xx:00)

Also aliased as: at_beginning_of_minute
change(options) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 120
def change(options)
  new_year   = options.fetch(:year, year)
  new_month  = options.fetch(:month, month)
  new_day    = options.fetch(:day, day)
  new_hour   = options.fetch(:hour, hour)
  new_min    = options.fetch(:min, options[:hour] ? 0 : min)
  new_sec    = options.fetch(:sec, (options[:hour] || options[:min]) ? 0 : sec)
  new_offset = options.fetch(:offset, nil)

  if new_nsec = options[:nsec]
    raise ArgumentError, "Can't change both :nsec and :usec at the same time: #{options.inspect}" if options[:usec]
    new_usec = Rational(new_nsec, 1000)
  else
    new_usec = options.fetch(:usec, (options[:hour] || options[:min] || options[:sec]) ? 0 : Rational(nsec, 1000))
  end

  raise ArgumentError, "argument out of range" if new_usec >= 1000000

  new_sec += Rational(new_usec, 1000000)

  if new_offset
    ::Time.new(new_year, new_month, new_day, new_hour, new_min, new_sec, new_offset)
  elsif utc?
    ::Time.utc(new_year, new_month, new_day, new_hour, new_min, new_sec)
  elsif zone
    ::Time.local(new_year, new_month, new_day, new_hour, new_min, new_sec)
  else
    ::Time.new(new_year, new_month, new_day, new_hour, new_min, new_sec, utc_offset)
  end
end

Returns a new Time where one or more of the elements have been changed according to the options parameter. The time options (:hour, :min, :sec, :usec, :nsec) reset cascadingly, so if only the hour is passed, then minute, sec, usec and nsec is set to 0. If the hour and minute is passed, then sec, usec and nsec is set to 0. The options parameter takes a hash with any of these keys: :year, :month, :day, :hour, :min, :sec, :usec, :nsec, :offset. Pass either :usec or :nsec, not both.

Time.new(2012, 8, 29, 22, 35, 0).change(day: 1)              # => Time.new(2012, 8, 1, 22, 35, 0)
Time.new(2012, 8, 29, 22, 35, 0).change(year: 1981, day: 1)  # => Time.new(1981, 8, 1, 22, 35, 0)
Time.new(2012, 8, 29, 22, 35, 0).change(year: 1981, hour: 0) # => Time.new(1981, 8, 29, 0, 0, 0)
compare_with_coercion(other) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 292
def compare_with_coercion(other)
  # we're avoiding Time#to_datetime and Time#to_time because they're expensive
  if other.class == Time
    compare_without_coercion(other)
  elsif other.is_a?(Time)
    compare_without_coercion(other.to_time)
  else
    to_datetime <=> other
  end
end

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

Also aliased as: <=>
compare_without_coercion(other)
Alias for: <=>
end_of_day() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 219
def end_of_day
  change(
    hour: 23,
    min: 59,
    sec: 59,
    usec: Rational(999999999, 1000)
  )
end

Returns a new Time representing the end of the day, 23:59:59.999999

Also aliased as: at_end_of_day
end_of_hour() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 236
def end_of_hour
  change(
    min: 59,
    sec: 59,
    usec: Rational(999999999, 1000)
  )
end

Returns a new Time representing the end of the hour, x:59:59.999999

Also aliased as: at_end_of_hour
end_of_minute() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 252
def end_of_minute
  change(
    sec: 59,
    usec: Rational(999999999, 1000)
  )
end

Returns a new Time representing the end of the minute, x:xx:59.999999

Also aliased as: at_end_of_minute
eql?(other)
Also aliased as: eql_without_coercion
Alias for: eql_with_coercion
eql_with_coercion(other) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 307
def eql_with_coercion(other)
  # if other is an ActiveSupport::TimeWithZone, coerce a Time instance from it so we can do eql? comparison
  other = other.comparable_time if other.respond_to?(:comparable_time)
  eql_without_coercion(other)
end

Layers additional behavior on #eql? so that ActiveSupport::TimeWithZone instances can be eql? to an equivalent Time

Also aliased as: eql?
eql_without_coercion(other)
Alias for: eql?
formatted_offset(colon = true, alternate_utc_string = nil) Show source
# File activesupport/lib/active_support/core_ext/time/conversions.rb, line 66
def formatted_offset(colon = true, alternate_utc_string = nil)
  utc? && alternate_utc_string || ActiveSupport::TimeZone.seconds_to_utc_offset(utc_offset, colon)
end

Returns a formatted string of the offset from UTC, or an alternative string if the time zone is already UTC.

Time.local(2000).formatted_offset        # => "-06:00"
Time.local(2000).formatted_offset(false) # => "-0600"
in(seconds)
Alias for: since
midday()
Alias for: middle_of_day
middle_of_day() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 209
def middle_of_day
  change(hour: 12)
end

Returns a new Time representing the middle of the day (12:00)

midnight()
Alias for: beginning_of_day
minus_with_coercion(other) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 283
def minus_with_coercion(other)
  other = other.comparable_time if other.respond_to?(:comparable_time)
  other.is_a?(DateTime) ? to_f - other.to_f : minus_without_coercion(other)
end

Time#- can also be used to determine the number of seconds between two Time instances. We're layering on additional behavior so that ActiveSupport::TimeWithZone instances are coerced into values that Time#- will recognize

Also aliased as: -
minus_without_coercion(other)
Alias for: -
minus_without_duration(other)
Alias for: -
next_day(days = 1) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 321
def next_day(days = 1)
  advance(days: days)
end

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

next_month(months = 1) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 331
def next_month(months = 1)
  advance(months: months)
end

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

next_year(years = 1) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 341
def next_year(years = 1)
  advance(years: years)
end

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

noon()
Alias for: middle_of_day
prev_day(days = 1) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 316
def prev_day(days = 1)
  advance(days: -days)
end

Returns a new time the specified number of days ago.

prev_month(months = 1) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 326
def prev_month(months = 1)
  advance(months: -months)
end

Returns a new time the specified number of months ago.

prev_year(years = 1) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 336
def prev_year(years = 1)
  advance(years: -years)
end

Returns a new time the specified number of years ago.

sec_fraction() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 104
def sec_fraction
  subsec
end

Returns the fraction of a second as a Rational

Time.new(2012, 8, 29, 0, 0, 0.5).sec_fraction # => (1/2)
seconds_since_midnight() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 88
def seconds_since_midnight
  to_i - change(hour: 0).to_i + (usec / 1.0e+6)
end

Returns the number of seconds since 00:00:00.

Time.new(2012, 8, 29,  0,  0,  0).seconds_since_midnight # => 0.0
Time.new(2012, 8, 29, 12, 34, 56).seconds_since_midnight # => 45296.0
Time.new(2012, 8, 29, 23, 59, 59).seconds_since_midnight # => 86399.0
seconds_until_end_of_day() Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 97
def seconds_until_end_of_day
  end_of_day.to_i - to_i
end

Returns the number of seconds until 23:59:59.

Time.new(2012, 8, 29,  0,  0,  0).seconds_until_end_of_day # => 86399
Time.new(2012, 8, 29, 12, 34, 56).seconds_until_end_of_day # => 41103
Time.new(2012, 8, 29, 23, 59, 59).seconds_until_end_of_day # => 0
since(seconds) Show source
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 193
def since(seconds)
  self + seconds
rescue
  to_datetime.since(seconds)
end

Returns a new Time representing the time a number of seconds since the instance time

Also aliased as: in
to_default_s(format = :default)
Alias for: to_s
to_formatted_s(format = :default) Show source
# File activesupport/lib/active_support/core_ext/time/conversions.rb, line 51
def to_formatted_s(format = :default)
  if formatter = DATE_FORMATS[format]
    formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
  else
    to_default_s
  end
end

Converts to a formatted string. See DATE_FORMATS for built-in formats.

This method is aliased to to_s.

time = Time.now                    # => 2007-01-18 06:10:17 -06:00

time.to_formatted_s(:time)         # => "06:10"
time.to_s(:time)                   # => "06:10"

time.to_formatted_s(:db)           # => "2007-01-18 06:10:17"
time.to_formatted_s(:number)       # => "20070118061017"
time.to_formatted_s(:short)        # => "18 Jan 06:10"
time.to_formatted_s(:long)         # => "January 18, 2007 06:10"
time.to_formatted_s(:long_ordinal) # => "January 18th, 2007 06:10"
time.to_formatted_s(:rfc822)       # => "Thu, 18 Jan 2007 06:10:17 -0600"
time.to_formatted_s(:iso8601)      # => "2007-01-18T06:10:17-06:00"

Adding your own time formats to to_formatted_s

You can add your own formats to the Time::DATE_FORMATS hash. Use the format name as the hash key and either a strftime string or Proc instance that takes a time argument as the value.

# config/initializers/time_formats.rb
Time::DATE_FORMATS[:month_and_year] = '%B %Y'
Time::DATE_FORMATS[:short_ordinal]  = ->(time) { time.strftime("%B #{time.day.ordinalize}") }
Also aliased as: to_s
to_s(format = :default)
Also aliased as: to_default_s
Alias for: to_formatted_s
to_time() Show source
# File activesupport/lib/active_support/core_ext/time/compatibility.rb, line 13
def to_time
  preserve_timezone ? self : getlocal
end

Either return self or the time in the local system timezone depending on the setting of ActiveSupport.to_time_preserves_timezone.

© 2004–2019 David Heinemeier Hansson
Licensed under the MIT License.