[Chicago] Daylight Savings Time in Python

[Garrett Smith]

On Wed, Aug 19, 2009 at 10:44 AM, Allan Spale<allan2600 at gmail.com> wrote:

<snip>

> So, if I am using at
> least Python 2.5, do the Python date and time modules calculate daylight
> savings time through operating system calls or is there internal code that
> performs these calculations? If Python figures out time changes internally,
> how does it update these time rules for each year (e.g. before the rules
> changed for daylight savings time and after the rule change)?

Based on the 2.6 source code it looks like the DST rules are hardcoded in C :)

This looks like it might help:

http://labix.org/python-dateutil

It uses the zoneinfo database, which should contain far more current
info than whatever version of Python is installed. At least it pushes
the problem off to the OS.