common.Timezone matches UTC and GMT with an optional offset (UTC+2,
GMT-05:30, GMT+0530) and a small table of upper case abbreviations
(EST, PDT, CET, ...), and sets Context.Location, so "10 pm EST" comes back
as 22:00 in a -05:00 zone. A timezone alone does not count as a match.
It is not added to common.All, so existing parsers behave as before.
dualfroz
upstream