#6574 Daylight saving timezone not recognized - Ruby on Rails

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#6574 ✓wontfix

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.

Time.now.zone # => "EST" last week, "EDT" this week.
Time.now.in_time_zone("EST").to_s # => ".... -0500"
Time.now.in_time_zone("EDT").to_s # => raises an error, see issue 6573

Comments and changes to this ticket

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.

Thanks,

Josh
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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 March 15th, 2011 @ 11:49 PM
Hey Marc,

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

Josh