We return a string prefaced with dateutil if it's a dateutil tz, else just the tz name. It needs to be a string so that we can serialize it with UJSON/pytables. maybe_get_tz (below) is the inverse of this process.
We need to do several things here: 1) Distinguish between pytz and dateutil timezones 2) Not be over-specific (e.g. US/Eastern with/without DST is same zone but a different tz object) 3) Provide something to serialize when we're storing a datetime object in pytables.
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