On Mar 19, 2013, at 6:21 AM, Izak van Langevelde <[email protected]> wrote:

> I'm working on a small week-based calendar, but for some reason, the week 
> number within the month of the first day of the month is either 0 or 1, while 
> I would expect it to be 1.

Haven't confirmed it for all the values you've shown, but I believe it is 
returning 0 in instances where the week in which the date falls has fewer than 
the calendar's minimumDaysInFirstWeek in the specified month.

For example, February 1st, 2013 was a Friday. If your calendar's default 
minimumDaysInFirstWeek is greater than two (in locales where Sunday is the 
first day of the week), I would expect a value of 0 for the WeekOfMonth, which 
is the result you got. Meanwhile, January 1st, 2013 was a Tuesday, which leaves 
either five or days in that week of the month (if the week starts on Sunday), 
which is probably greater than the calendar's default minimumDaysInFirstWeek.

--Kyle Sluder
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