Michael,
> Is there a PostgreSQL function to return the number of days in a
> month?
No. You could fairly easily write a SQL function to do this, though.
The function should do the following:
1. Accept a year and month as input.
2. Create a DATETIME value that is the 1st day of that year and month
3. Add one month to the datetime value.
4. Subtract one day from the datetime value
5. Extract the day of the month from that datetime value.
6. The day of the month is your number of days.
For the tools to do this, see:
http://www.postgresql.org/idocs/index.php?functions-datetime.html
and
http://techdocs.postgresql.org/techdocs/faqdatesintervals.php
-Josh Berkus
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