Class: TZInfo::Timestamp

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/tzinfo/timestamp.rb

Overview

A time represented as an Integer number of seconds since 1970-01-01 00:00:00 UTC (ignoring leap seconds), the fraction through the second (sub_second as a Rational) and an optional UTC offset. Like Ruby's Time class, Timestamp can distinguish between a local time with a zero offset and a time specified explicitly as UTC.

Direct Known Subclasses

TimestampWithOffset

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(value, sub_second = 0, utc_offset = nil) ⇒ Timestamp

Initializes a new TZInfo::Timestamp.

Parameters:

  • value (Integer)

    the number of seconds since 1970-01-01 00:00:00 UTC ignoring leap seconds.

  • sub_second (Numeric) (defaults to: 0)

    the fractional part of the second as either a Rational that is greater than or equal to 0 and less than 1, or the Integer 0.

  • utc_offset (Object) (defaults to: nil)

    either nil for a TZInfo::Timestamp without a specified offset, an offset from UTC specified as an Integer number of seconds or the Symbol :utc).

Raises:

  • (ArgumentError)

    if value is not an Integer.

  • (ArgumentError)

    if sub_second is not a Rational, or the Integer 0.

  • (RangeError)

    if sub_second is a Rational but that is less than 0 or greater than or equal to 1.

  • (ArgumentError)

    if utc_offset is not nil, not an Integer and not the Symbol :utc.


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# File 'lib/tzinfo/timestamp.rb', line 342

def initialize(value, sub_second = 0, utc_offset = nil)
  raise ArgumentError, 'value must be an Integer' unless value.kind_of?(Integer)
  raise ArgumentError, 'sub_second must be a Rational or the Integer 0' unless (sub_second.kind_of?(Integer) && sub_second == 0) || sub_second.kind_of?(Rational)
  raise RangeError, 'sub_second must be >= 0 and < 1' if sub_second < 0 || sub_second >= 1
  raise ArgumentError, 'utc_offset must be an Integer, :utc or nil' if utc_offset && utc_offset != :utc && !utc_offset.kind_of?(Integer)
  initialize!(value, sub_second, utc_offset)
end

Instance Attribute Details

#sub_secondNumeric (readonly)

Returns the fraction of a second elapsed since timestamp as either a Rational or the Integer 0. Always greater than or equal to 0 and less than 1.

Returns:

  • (Numeric)

    the fraction of a second elapsed since timestamp as either a Rational or the Integer 0. Always greater than or equal to 0 and less than 1.


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# File 'lib/tzinfo/timestamp.rb', line 319

def sub_second
  @sub_second
end

#utc_offsetInteger (readonly)

Returns the offset from UTC in seconds or nil if the TZInfo::Timestamp doesn't have a specified offset.

Returns:

  • (Integer)

    the offset from UTC in seconds or nil if the TZInfo::Timestamp doesn't have a specified offset.


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# File 'lib/tzinfo/timestamp.rb', line 323

def utc_offset
  @utc_offset
end

#valueInteger (readonly)

Returns the number of seconds since 1970-01-01 00:00:00 UTC ignoring leap seconds (i.e. each day is treated as if it were 86,400 seconds long).

Returns:

  • (Integer)

    the number of seconds since 1970-01-01 00:00:00 UTC ignoring leap seconds (i.e. each day is treated as if it were 86,400 seconds long).


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# File 'lib/tzinfo/timestamp.rb', line 314

def value
  @value
end

Class Method Details

.create(year, month = 1, day = 1, hour = 0, minute = 0, second = 0, sub_second = 0, utc_offset = nil) ⇒ Timestamp

Returns a new TZInfo::Timestamp representing the (Gregorian calendar) date and time specified by the supplied parameters.

If utc_offset is nil, :utc or 0, the date and time parameters will be interpreted as representing a UTC date and time. Otherwise the date and time parameters will be interpreted as a local date and time with the given offset.

Parameters:

  • year (Integer)

    the year.

  • month (Integer) (defaults to: 1)

    the month (1-12).

  • day (Integer) (defaults to: 1)

    the day of the month (1-31).

  • hour (Integer) (defaults to: 0)

    the hour (0-23).

  • minute (Integer) (defaults to: 0)

    the minute (0-59).

  • second (Integer) (defaults to: 0)

    the second (0-59).

  • sub_second (Numeric) (defaults to: 0)

    the fractional part of the second as either a Rational that is greater than or equal to 0 and less than 1, or the Integer 0.

  • utc_offset (Object) (defaults to: nil)

    either nil for a TZInfo::Timestamp without a specified offset, an offset from UTC specified as an Integer number of seconds or the Symbol :utc).

Returns:

Raises:

  • (ArgumentError)

    if either of year, month, day, hour, minute, or second is not an Integer.

  • (ArgumentError)

    if sub_second is not a Rational, or the Integer 0.

  • (ArgumentError)

    if utc_offset is not nil, not an Integer and not the Symbol :utc.

  • (RangeError)

    if month is not between 1 and 12.

  • (RangeError)

    if day is not between 1 and 31.

  • (RangeError)

    if hour is not between 0 and 23.

  • (RangeError)

    if minute is not between 0 and 59.

  • (RangeError)

    if second is not between 0 and 59.

  • (RangeError)

    if sub_second is a Rational but that is less than 0 or greater than or equal to 1.


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# File 'lib/tzinfo/timestamp.rb', line 54

def create(year, month = 1, day = 1, hour = 0, minute = 0, second = 0, sub_second = 0, utc_offset = nil)
  raise ArgumentError, 'year must be an Integer' unless year.kind_of?(Integer)
  raise ArgumentError, 'month must be an Integer' unless month.kind_of?(Integer)
  raise ArgumentError, 'day must be an Integer' unless day.kind_of?(Integer)
  raise ArgumentError, 'hour must be an Integer' unless hour.kind_of?(Integer)
  raise ArgumentError, 'minute must be an Integer' unless minute.kind_of?(Integer)
  raise ArgumentError, 'second must be an Integer' unless second.kind_of?(Integer)
  raise RangeError, 'month must be between 1 and 12' if month < 1 || month > 12
  raise RangeError, 'day must be between 1 and 31' if day < 1 || day > 31
  raise RangeError, 'hour must be between 0 and 23' if hour < 0 || hour > 23
  raise RangeError, 'minute must be between 0 and 59' if minute < 0 || minute > 59
  raise RangeError, 'second must be between 0 and 59' if second < 0 || second > 59

  # Based on days_from_civil from https://howardhinnant.github.io/date_algorithms.html#days_from_civil
  after_february = month > 2
  year -= 1 unless after_february
  era = year / 400
  year_of_era = year - era * 400
  day_of_year = (153 * (month + (after_february ? -3 : 9)) + 2) / 5 + day - 1
  day_of_era = year_of_era * 365 + year_of_era / 4 - year_of_era / 100 + day_of_year
  days_since_epoch = era * 146097 + day_of_era - 719468
  value = ((days_since_epoch * 24 + hour) * 60 + minute) * 60 + second
  value -= utc_offset if utc_offset.kind_of?(Integer)

  new(value, sub_second, utc_offset)
end

.for(value, offset = :preserve) {|timestamp| ... } ⇒ Object

When used without a block, returns a TZInfo::Timestamp representation of a given Time, DateTime or TZInfo::Timestamp.

When called with a block, the TZInfo::Timestamp representation of value is passed to the block. The block must then return a TZInfo::Timestamp, which will be converted back to the type of the initial value. If the initial value was a TZInfo::Timestamp, the block result will just be returned.

The UTC offset of value can either be preserved (the TZInfo::Timestamp representation will have the same UTC offset as value), ignored (the TZInfo::Timestamp representation will have no defined UTC offset), or treated as though it were UTC (the TZInfo::Timestamp representation will have a #utc_offset of 0 and #utc? will return true).

Parameters:

  • value (Object)

    a Time, DateTime or TZInfo::Timestamp.

  • offset (Symbol) (defaults to: :preserve)

    either :preserve to preserve the offset of value, :ignore to ignore the offset of value and create a TZInfo::Timestamp with an unspecified offset, or :treat_as_utc to treat the offset of value as though it were UTC and create a UTC TZInfo::Timestamp.

Yields:

  • (timestamp)

    if a block is provided, the TZInfo::Timestamp representation is passed to the block.

Yield Parameters:

Yield Returns:

Returns:

  • (Object)

    if called without a block, the TZInfo::Timestamp representation of value, otherwise the result of the block, converted back to the type of value.

Raises:

  • (ArgumentError)

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# File 'lib/tzinfo/timestamp.rb', line 110

def for(value, offset = :preserve)
  raise ArgumentError, 'value must be specified' unless value

  case offset
    when :ignore
      ignore_offset = true
      target_utc_offset = nil
    when :treat_as_utc
      ignore_offset = true
      target_utc_offset = :utc
    when :preserve
      ignore_offset = false
      target_utc_offset = nil
    else
      raise ArgumentError, 'offset must be :preserve, :ignore or :treat_as_utc'
  end

  time_like = false
  timestamp = case value
    when Time
      for_time(value, ignore_offset, target_utc_offset)
    when DateTime
      for_datetime(value, ignore_offset, target_utc_offset)
    when Timestamp
      for_timestamp(value, ignore_offset, target_utc_offset)
    else
      raise ArgumentError, "#{value.class} values are not supported" unless is_time_like?(value)
      time_like = true
      for_time_like(value, ignore_offset, target_utc_offset)
  end

  if block_given?
    result = yield timestamp
    raise ArgumentError, 'block must return a Timestamp' unless result.kind_of?(Timestamp)

    case value
      when Time
        result.to_time
      when DateTime
        result.to_datetime
      else # A Time-like value or a Timestamp
        time_like ? result.to_time : result
    end
  else
    timestamp
  end
end

.utc(value, sub_second = 0) ⇒ Object

Creates a new UTC TZInfo::Timestamp.

Parameters:

  • value (Integer)

    the number of seconds since 1970-01-01 00:00:00 UTC ignoring leap seconds.

  • sub_second (Numeric) (defaults to: 0)

    the fractional part of the second as either a Rational that is greater than or equal to 0 and less than 1, or the Integer 0.

Raises:

  • (ArgumentError)

    if value is not an Integer.

  • (ArgumentError)

    if sub_second is not a Rational, or the Integer 0.

  • (RangeError)

    if sub_second is a Rational but that is less than 0 or greater than or equal to 1.


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# File 'lib/tzinfo/timestamp.rb', line 170

def utc(value, sub_second = 0)
  new(value, sub_second, :utc)
end

Instance Method Details

#<=>(t) ⇒ Integer

Compares this TZInfo::Timestamp with another.

TZInfo::Timestamp instances without a defined UTC offset are not comparable with TZInfo::Timestamp instances that have a defined UTC offset.

Parameters:

Returns:

  • (Integer)

    -1, 0 or 1 depending if this instance is earlier, equal or later than t respectively. Returns nil when comparing a TZInfo::Timestamp that does not have a defined UTC offset with a TZInfo::Timestamp that does have a defined UTC offset. Returns nil if t is not a TZInfo::Timestamp.


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# File 'lib/tzinfo/timestamp.rb', line 452

def <=>(t)
  return nil unless t.kind_of?(Timestamp)
  return nil if utc_offset && !t.utc_offset
  return nil if !utc_offset && t.utc_offset

  result = value <=> t.value
  result = sub_second <=> t.sub_second if result == 0
  result
end

#add_and_set_utc_offset(seconds, utc_offset) ⇒ Timestamp

Adds a number of seconds to the TZInfo::Timestamp value, setting the UTC offset of the result.

Parameters:

  • seconds (Integer)

    the number of seconds to be added.

  • utc_offset (Object)

    either nil for a TZInfo::Timestamp without a specified offset, an offset from UTC specified as an Integer number of seconds or the Symbol :utc).

Returns:

Raises:

  • (ArgumentError)

    if seconds is not an Integer.

  • (ArgumentError)

    if utc_offset is not nil, not an Integer and not the Symbol :utc.


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# File 'lib/tzinfo/timestamp.rb', line 370

def add_and_set_utc_offset(seconds, utc_offset)
  raise ArgumentError, 'seconds must be an Integer' unless seconds.kind_of?(Integer)
  raise ArgumentError, 'utc_offset must be an Integer, :utc or nil' if utc_offset && utc_offset != :utc && !utc_offset.kind_of?(Integer)
  return self if seconds == 0 && utc_offset == (@utc ? :utc : @utc_offset)
  Timestamp.send(:new!, @value + seconds, @sub_second, utc_offset)
end

#hashInteger

Returns a hash based on the value, sub-second and whether there is a defined UTC offset.

Returns:

  • (Integer)

    a hash based on the value, sub-second and whether there is a defined UTC offset.


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# File 'lib/tzinfo/timestamp.rb', line 466

def hash
  [@value, @sub_second, !!@utc_offset].hash
end

#inspectString

Returns the internal object state as a programmer-readable String.

Returns:

  • (String)

    the internal object state as a programmer-readable String.


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# File 'lib/tzinfo/timestamp.rb', line 472

def inspect
  "#<#{self.class}: @value=#{@value}, @sub_second=#{@sub_second}, @utc_offset=#{@utc_offset.inspect}, @utc=#{@utc.inspect}>"
end

#strftime(format) ⇒ String

Formats this TZInfo::Timestamp according to the directives in the given format string.

Parameters:

  • format (String)

    the format string. Please refer to Time#strftime for a list of supported format directives.

Returns:

Raises:

  • (ArgumentError)

    if format is not specified.


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# File 'lib/tzinfo/timestamp.rb', line 424

def strftime(format)
  raise ArgumentError, 'format must be specified' unless format
  to_time.strftime(format)
end

#to_datetimeDateTime

Converts this TZInfo::Timestamp to a DateTime.

Returns:


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# File 'lib/tzinfo/timestamp.rb', line 404

def to_datetime
  new_datetime
end

#to_iInteger

Converts this TZInfo::Timestamp to an Integer number of seconds since 1970-01-01 00:00:00 UTC (ignoring leap seconds).

Returns:

  • (Integer)

    an Integer representation of this TZInfo::Timestamp (the number of seconds since 1970-01-01 00:00:00 UTC ignoring leap seconds).


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# File 'lib/tzinfo/timestamp.rb', line 413

def to_i
  value
end

#to_sString

Returns a String representation of this TZInfo::Timestamp.

Returns:


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# File 'lib/tzinfo/timestamp.rb', line 430

def to_s
  return value_and_sub_second_to_s unless @utc_offset
  return "#{value_and_sub_second_to_s} UTC" if @utc

  sign = @utc_offset >= 0 ? '+' : '-'
  min, sec = @utc_offset.abs.divmod(60)
  hour, min = min.divmod(60)

  "#{value_and_sub_second_to_s(@utc_offset)} #{sign}#{'%02d' % hour}:#{'%02d' % min}#{sec > 0 ? ':%02d' % sec : nil}#{@utc_offset != 0 ? " (#{value_and_sub_second_to_s} UTC)" : nil}"
end

#to_timeTime

Converts this TZInfo::Timestamp to a Time.

Returns:


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# File 'lib/tzinfo/timestamp.rb', line 389

def to_time
  time = new_time

  if @utc_offset && !@utc
    time.localtime(@utc_offset)
  else
    time.utc
  end
end

#utcTimestamp

Returns a UTC TZInfo::Timestamp equivalent to this instance. Returns self if self.utc? is true.

Returns:


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# File 'lib/tzinfo/timestamp.rb', line 379

def utc
  return self if @utc
  Timestamp.send(:new!, @value, @sub_second, :utc)
end

#utc?Boolean

Returns true if this TZInfo::Timestamp represents UTC, false if the TZInfo::Timestamp wasn't specified as UTC or nil if the TZInfo::Timestamp has no specified offset.

Returns:


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# File 'lib/tzinfo/timestamp.rb', line 353

def utc?
  @utc
end