Sensible defaults for tzinfos #575
Description
So we don't want to hard-code tzinfos, but I claim that the following or something like it would be a Sensible Default for tzinfos (at least for US users)
tzinfos_us = {
'PST': dateutil.tz.gettz('US/Pacific'),
'PDT': dateutil.tz.gettz('US/Pacific'),
'PT': dateutil.tz.gettz('US/Pacific'),
'MST': dateutil.tz.gettz('US/Mountain'),
'MDT': dateutil.tz.gettz('US/Mountain'),
'MT': dateutil.tz.gettz('US/Mountain'),
'CST': dateutil.tz.gettz('US/Central'),
'CDT': dateutil.tz.gettz('US/Central'),
'CT': dateutil.tz.gettz('US/Central'),
'EST': dateutil.tz.gettz('US/Eastern'),
'EDT': dateutil.tz.gettz('US/Eastern'),
'ET': dateutil.tz.gettz('US/Eastern')}
There are others that are pretty close to unambiguous: BRST, CEST, ... If this would make it easier for a large fraction of users to Do It Right, then we should consider providing a shortcut to something like this.