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OK, this is more a curiosity question, but how does pytz know all the daylight savings times (DST)? For example, that 'Europe/Copenhagen' time switches in March and October.
Or rather, what happens if a country decides to do away with DST? Will everyone have to get an updated version of Pytz? Is there someone "at pytz" keeping track of this? Is there a formal list somewhere?
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Introduction. pytz brings the Olson tz database into Python. This library allows accurate and cross platform timezone calculations using Python 2.4 or higher. It also solves the issue of ambiguous times at the end of daylight saving time, which you can read more about in the Python Library Reference ( datetime.
daylight() Function. Time. daylight() function which returns a non zero integer value when Daylight Saving Time (DST) is defined, else it returns 0.
You should use datetime. datetime. utcnow(). astimezone(tz) -- This gets the time in UTC and then offsets it from UTC according to whatever rules apply in the timezone tz.
The pytz module allows for date-time conversion and timezone calculations so that your Python applications can keep track of dates and times, while staying accurate to the timezone of a particular location.
PyTZ uses the Olson timezone database, and it updates regularly. PyTZ is not the only user; most POSIX systems use it too, including Linux and OS X.
Yes, new revisions of PyTZ are packaged whenever that database updates.
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From the "Latest Versions" section of the pytz documentation:
This package will be updated after releases of the Olson timezone database.
So the answers to your questions appear to be yes, an update will be released if the tz database is updated, and you will need to update your installation of pytz.
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