Chrome, Safari and Firefox serialize Date objects to strings such
as 'Mon May 28 2012 00:00:00 GMT-0700 (PDT)'. When these strings
are parsed the zone is interpreted as 'GMT-0700' which doesn't
exist in the TzInfo list of timezones.
By taking advantage of the improved date/time handling in 1.9.3
we can use `Date._parse` and the `:offset` value which is parsed
Three tests were amended to make them pass:
This needed changing to a different value because the original
value was before EST was adopted so was being changed to a
LMT (Local Mean Time) value after the change. It didn't before
because `DateTime` just has offsets from UTC not timezones.
Changed the implementation of this test as the stubs were
dependent on internal implementation details of the test.
Confirmed that the modified test still failed when the
implementation of `parse` was restored to pre-#5571.