pytz 2009a

World timezone definitions, modern and historical

World modern and historical timezone definitions, implemented as Python tzinfo subclasses suitable for use my Python’s datetime module. Timezone information was provided by the Olson Timezone database. Using these timezone definitions resolves all ambiguous daylight savings time transitions. All DST trantions have been tested against the reference implementation of zdump found in the Olson database to confirm even the obscure historical cases work. This test suite is available separatly as it is rather large (75558 comparisons), as is the program used to generate this package.

The Olson Timezone database is updated several times per year, usually with obscure and generally unnoticable changes. These files will be regenerated and rereleased soon after updated editions of the Olson database are made available.