Parsing crontab-style lines

Perhaps the python package croniter suits your needs.

Usage example:

>>> import croniter
>>> import datetime
>>> now = datetime.datetime.now()
>>> cron = croniter.croniter('45 17 */2  * *', now)
>>> cron.get_next(datetime.datetime)
datetime.datetime(2011, 9, 14, 17, 45)
>>> cron.get_next(datetime.datetime)
datetime.datetime(2011, 9, 16, 17, 45)
>>> cron.get_next(datetime.datetime)
datetime.datetime(2011, 9, 18, 17, 45)

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