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#6574 ✓wontfix
Marc-André Lafortune

Daylight saving timezone not recognized

Reported by Marc-André Lafortune | March 14th, 2011 @ 02:57 PM

While the time zone "EST" is recognized, "EDT" isn't. # => "EST" last week, "EDT" this week."EST").to_s # => ".... -0500""EDT").to_s # => raises an error, see issue 6573

Comments and changes to this ticket

  • Josh Kalderimis

    Josh Kalderimis March 15th, 2011 @ 08:53 PM

    • Tag changed from rails3 activesupport, bug, timezone to active_support, timezone
    • State changed from “new” to “wontfix”
    • Importance changed from “” to “Low”

    Hi Marc,

    The EST timezone is defined in the TZInfo gem. I looked into it further and EDT is defined but it is called EST5EDT.



  • Marc-André Lafortune

    Marc-André Lafortune March 15th, 2011 @ 10:45 PM

    Thanks for looking it up.

    For the record, EST5EDT is not quite "EDT". It is the same as "Eastern Time (US & Canada)", i.e. EST (UTC-5) in the 'winter', and 'EDT' (UTC-4) in the 'summer'.

    So "EDT" is not an actual timezone, more like the state of a timezone. For instance it would not make any sense to ask for Time.utc(2011,1,1).in_time_zone("EDT"). Note that "EST" is a timezone, used in a few places that do not use Daylight savings time and are (UTC-5) yearlong.

    Sorry for my confusion.

  • Josh Kalderimis

    Josh Kalderimis March 15th, 2011 @ 11:49 PM

    Hey Marc,

    Thanks for the reply and for letting me know what the real issue / solution is.


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