Steve beat me, and using dateutils is probably the sensible thing to do, but in pure python: #!/usr/bin/python from datetime import date, timedelta start = date(2014, 8, 12) print("21 day intervals:") for i in range(24): print(start + i * timedelta(days=21)) # I'm not 100% confident about this because dates and times are # evil and usually manage to confound my expectations somehow, but: print("Every second Tuesday:") current = start print(current) for i in range(23): current += timedelta(days=28) if current.day < 8: current += timedelta(days=7) print(current) On 17/07/14 11:05, Steve Engledow wrote:

On 17/07, Michael Goddard wrote:

...

I'm on a volunteer project and want to use program/app that will give me fixed dates over a given period. For instance, a given start date and dates for each 21 day period thereafter, or what are the dates of the second tuesday each month over a given period.

...

I'm quite prepared to do my own DIY learning etc, but would appreciate a heads up in the right direction rather than stumbling down too many blind alleys in an effort to find, I hope, a simple program/app that would do this task.

If you're up for doing some (fairly trivial) programming, then [python-dateutil](http://labix.org/python-dateutil) probably does all the things you need :)

Steve

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