TimeWithZoneとDateTimeのiso8601の形式が若干異なりはまったのでメモ
[1] pry(main)> Time.zone.now.utc.iso8601
=> "2016-07-08T14:18:51Z"
[2] pry(main)> DateTime.now.utc.iso8601
=> "2016-07-08T14:19:03+00:00"
TimeWithZoneのほうは語尾が"Z"で
DateTimeのほうは語尾が"+00:00"です
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TimeWithZoneとDateTimeのiso8601の形式が若干異なりはまったのでメモ
[1] pry(main)> Time.zone.now.utc.iso8601
=> "2016-07-08T14:18:51Z"
[2] pry(main)> DateTime.now.utc.iso8601
=> "2016-07-08T14:19:03+00:00"
TimeWithZoneのほうは語尾が"Z"で
DateTimeのほうは語尾が"+00:00"です
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