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Rubyでミリ秒、マイクロ秒単位のTimeを扱う

Posted at

ミリ秒を含む文字列に変換

  • Time#iso8601
  • TIme#xmlschema
require 'time'

time = Time.now
=> 2016-07-01 13:03:00 +0900

# マイクロ秒部分を整数で取得
time.usec
=> 193967

# iso8601フォーマットでマイクロ秒含めて表示
time.iso8601(6)
=> "2016-07-01T13:03:00.193967+09:00"

# 引数に小数点以下の桁数を入れるのでミリ秒なら3を指定する
irb(main):009:0> time.iso8601(3)
=> "2016-07-01T13:03:00.193+09:00"

# xmlschemaメソッドも同義
irb(main):010:0> time.xmlschema(3)
=> "2016-07-01T13:03:00.193+09:00"

文字列からTimeを生成

ISO8601フォーマットの文字列から生成する
* Time.iso8601
* Time.xmlschema

より多様なフォーマットに対応できる
* Time.parse

time = Time.iso8601("2016-07-01T13:03:00.193967+09:00")
#=> 2016-07-01 13:03:00 +0900
time.usec
#=> 193967

time = Time.xmlschema("2016-07-01T13:08:56.629+09:00")
#=> 2016-07-01 13:08:56 +0900
time.usec
#=> 629000

time = Time.parse("2016-07-01T13:12:59.035692+09:00")
#=> 2016-07-01 13:12:59 +0900
time.usec
#=> 35692
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