I'm happy to announce the first fully functional release of time-recurrence:
http://hackage.haskell.org/package/time-recurrence
As of version 0.5.2, the library is now powerful enough to express all
recurring dates which can be specified via the iCalendar RFC.
An example:
Generate the 15th and the 30th of the month, but only during the work week:
> jan2011 = ptime "Sat, 01 Jan 2011 00:00:00 -0400"
> jan2012 = ptime "Sun, 01 Jan 2012 00:00:00 -0400"
> takeWhile (<= jan2012) $ recur monthly `starting` jan2011 $
> enumDays [15,30] >=>
> filterWeekDays [Monday .. Friday]
[2011-02-15 04:00:00 UTC
,2011-03-15 04:00:00 UTC, 2011-03-30 04:00:00 UTC
,2011-04-15 04:00:00 UTC
,2011-05-30 04:00:00 UTC
,2011-06-15 04:00:00 UTC, 2011-06-30 04:00:00 UTC
,2011-07-15 04:00:00 UTC
,2011-08-15 04:00:00 UTC, 2011-08-30 04:00:00 UTC
,2011-09-15 04:00:00 UTC, 2011-09-30 04:00:00 UTC
,2011-11-15 04:00:00 UTC, 2011-11-30 04:00:00 UTC
,2011-12-15 04:00:00 UTC, 2011-12-30 04:00:00 UTC
]
As always I encourage feedback, criticism, suggestions and pull requests.
-Chris
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