Hi

I must be slipping, but say I have a string that looks like:

3/11/2012 2:50:00 AM

If I use the UTC timezone and ask it to parse this time, what would you expect the result to be? Personally, I'd say

3/11/2012 2:50:00 AM UTC

Given this is the DST switchover date (for some places) this is an edge case. It's the "spring forward" rule so 2:50 AM is 3:50... But not in UTC... that's one of the nice things about UTC. So, I was surprised when:

ActiveSupport::TimeZone["UTC"].parse("3/11/2012 2:50:00 AM")  => Sun, 11 Mar 2012 03:50:00 UTC +00:00

Ok, maybe the AM trips it up into thinking I'm not really UTC because I'm not using a 24 clock? Nope:

ActiveSupport::TimeZone["UTC"].parse("3/11/2012 2:50:00")  => Sun, 11 Mar 2012 03:50:00 UTC +00:00

But, if I append " UTC" to the string it works as I expect:

ActiveSupport::TimeZone["UTC"].parse("3/11/2012 2:50:00 UTC") => Sun, 11 Mar 2012 02:50:00 UTC +00:00
ActiveSupport::TimeZone["UTC"].parse("3/11/2012 2:50:00 AM UTC") => Sun, 11 Mar 2012 02:50:00 UTC +00:00

I looked at the documentation and parse for AR:TZ takes two parameters, the second being a "now" that:

If upper components are missing from the string, they are supplied from #now

(http://api.rubyonrails.org/classes/ActiveSupport/TimeZone.html#method-i-parse)

So, I tried passing in a UTC current time, but it also went back to 3:50:

ActiveSupport::TimeZone["UTC"].parse("3/11/2012 2:50:00", ActiveSupport::TimeZone["UTC"].now) => Sun, 11 Mar 2012 03:50:00 UTC +00:00

For reference, I'm using:

tzinfo 0.3.33
activesupport 3.2.6

Am I being stupid here? A cursory googling led to

https://rails.lighthouseapp.com/projects/8994/tickets/2470-cannot-make-zoneparse-create-given-time-dst

The wontfix is indicative, but maybe this should at least be a gotcha in the documentation? Again, apologies if I'm being dense and have missed something obvious.

Thanks,
Andrew

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