struct Time

Overview

Time represents an instance in time. Here are some examples:

Basic Usage

time = Time.now # => 2016-02-15 10:20:30 UTC

time.year    # => 2015
time.month   # => 2
time.day     # => 15
time.hour    # => 10
time.minute  # => 20
time.second  # => 30
time.monday? # => true

# Creating a time instance with a date only
Time.new(2016, 2, 15) # => 2016-02-15 00:00:00

# Specifying a time
Time.new(2016, 2, 15, 10, 20, 30) # => 2016-02-15 10:20:30 UTC

Formatting Time

The #to_s method returns a String value in the assigned format.

Time.now.to_s("%Y-%m-%d") # => "2015-10-12"

See Time::Format for all the directives.

Calculation

Time.new(2015, 10, 10) - 5.days # => 2015-10-05 00:00:00

# Time calculation returns a Time::Span instance
span = Time.new(2015, 10, 10) - Time.new(2015, 9, 10)
span.days          # => 30
span.total_hours   # => 720
span.total_minutes # => 43200

# Calculation between Time::Span instances
span_a = Time::Span.new(3, 0, 0)
span_b = Time::Span.new(2, 0, 0)
span = span_a - span_b
span       # => 01:00:00
span.class # => Time::Span
span.hours # => 1

Included Modules

Defined in:

time.cr

Constant Summary

DAYS_MONTH = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
DAYS_MONTH_LEAP = [0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
DP100 = 36524
DP4 = 1461
DP400 = 146097
KindMask = 13835058055282163712_u64
KindShift = 62_i64
MAX_VALUE_TICKS = 3155378975999999999_i64
MaxValue = new(3155378975999999999_i64)
MinValue = new(0)
TicksMask = 4611686018427387903_i64
UnixEpoch = 621355968000000000_i64

Class Method Summary

Instance Method Summary

Macro Summary

Instance methods inherited from module Comparable({"T", T})

<(other : T) <, <=(other : T) <=, <=>(other : T) <=>, ==(other : T) ==, >(other : T) >, >=(other : T) >=

Instance methods inherited from struct Struct

==(other : self) : Bool ==, hash : Int32 hash, inspect(io : IO) : Nil inspect, to_s(io) to_s

Instance methods inherited from struct Value

==(other) ==, dup dup

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other)
===(other : YAML::Any)
===(other : JSON::Any)
===
, =~(other) =~, class class, crystal_type_id crystal_type_id, dup dup, hash hash, inspect(io : IO)
inspect
inspect
, itself itself, not_nil! not_nil!, tap(&block) tap, to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ")
to_pretty_json
, to_s
to_s(io : IO)
to_s
, to_yaml
to_yaml(io : IO)
to_yaml
, try(&block) try

Class methods inherited from class Object

==(other : Class) ==, ===(other) ===, cast(other) : self cast, clone clone, dup dup, from_json(string_or_io) : self
from_json(string_or_io, root : String) : self
from_json
, from_yaml(string : String) : self from_yaml, hash hash, inspect(io) inspect, name : String name, nilable? nilable?, to_s(io) to_s, |(other : U.class) forall U |

Class Method Detail

def self.days_in_month(year, month) : Int32 #

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def self.epoch(seconds : Int) : self #

Returns a new Time instance that corresponds to the number seconds elapsed since the unix epoch (00:00:00 UTC on 1 January 1970)

Time.epoch(981173106) # => 2001-02-03 04:05:06 UTC

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def self.epoch_ms(milliseconds : Int) : self #

Returns a new Time instance that corresponds to the number milliseconds elapsed since the unix epoch (00:00:00 UTC on 1 January 1970)

time = Time.epoch_ms(981173106789) # => 2001-02-03 04:05:06 UTC
time.millisecond                   # => 789

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def self.leap_year?(year) : Bool #

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def self.local_offset_in_minutes #

Returns the local time offset in minutes relative to GMT.

# Assume in Argentina, where it's GMT-3
Time.local_offset_in_minutes # => -180

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def self.local_ticks #

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def self.new(year, month, day, hour = 0, minute = 0, second = 0, millisecond = 0, kind = Kind::Unspecified) #

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def self.new #

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def self.new(ticks : Int, kind = Kind::Unspecified) #

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def self.new(time : LibC::Timespec, kind = Kind::Unspecified) #

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def self.now : self #

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def self.parse(time : String, pattern : String, kind = Time::Kind::Unspecified) : self #

Parses a Time in the given time string, using the given pattern (see Time::Format).

Time.parse("2016-04-05", "%F") # => 2016-04-05 00:00:00

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def self.utc_now : self #

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def self.utc_ticks #

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Instance Method Detail

def +(other : MonthSpan) #

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def +(other : Span) #

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def -(other : Span) #

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def -(other : MonthSpan) #

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def -(other : Int) #

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def -(other : Time) #

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def <=>(other : self) #

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def add_ticks(value) #

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def at_beginning_of_day #

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def at_beginning_of_hour #

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def at_beginning_of_minute #

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def at_beginning_of_month #

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def at_beginning_of_quarter #

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def at_beginning_of_semester #

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def at_beginning_of_week #

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def at_beginning_of_year #

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def at_end_of_day #

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def at_end_of_hour #

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def at_end_of_minute #

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def at_end_of_month #

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def at_end_of_quarter #

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def at_end_of_semester #

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def at_end_of_week #

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def at_end_of_year #

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def at_midday #

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def date #

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def day #

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def day_of_week #

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def day_of_year #

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def epoch : Int64 #

Returns the number of seconds since the Epoch for this time.

Time.new(2016, 1, 2, 3, 4, 5).epoch # => 1451714645

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def epoch_f : Float64 #

Returns the number of seconds since the Epoch for this time, as a Float64.

Time.new(2016, 1, 2, 3, 4, 5, 678).epoch_f # => 1.45171e+09

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def epoch_ms : Int64 #

Returns the number of milliseconds since the Epoch for this time.

Time.new(2016, 1, 2, 3, 4, 5, 678).epoch_ms # => 1451714645678

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def friday? #

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def hash : Int64 #

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def hour #

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def inspect(io : IO) #

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def kind #

Returns Kind of the instance.


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def local? #

Returns true if Kind is set to Local.


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def millisecond #

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def minute #

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def monday? #

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def month #

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def saturday? #

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def second #

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def sunday? #

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def thursday? #

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def ticks #

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def time_of_day #

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def to_local #

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def to_s(format : String) : String #

Formats this time using the given format (see Time::Format).

Time.now.to_s("%F") # => "2016-04-05"

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def to_s(format : String, io : IO) #

Formats this time using the given format (see Time::Format) into the given io.


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def to_utc #

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def tuesday? #

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def utc? #

Returns true if Kind is set to Utc.


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def wednesday? #

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def year #

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Macro Detail

macro def_at(name) #

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