NSTimestamp Behaviour

Hello,

Does anyone know the behaviour of NSTimestamp when a 0 is put in the  
date field.

For example...

The constructor I am using is:

NSTimestamp(int year, int month, int date, int hour, int minute, int  
second, TimeZone tz)

I am passing in:

NSTimestamp(Integer.parseInt(aSelectedYear), aSelectedMonth, 0, 0, 0,  
0, TimeZone.getTimeZone("GMT-4"))

The documentation says that date should be between 1 and 31.  Still  
the constructor doesn't throw an exception when I pass a 0 into the  
date field.  It seems to be decrementing the value of  
aSelectedMonth.  For instance if aSelectedMonth = 6 (June) the value  
of aSelectedMonth becomes 5 (May).  If aSelectedMonth = 1 (January)  
it wraps around to become 12 (December).  Does anyone know if this is  
supposed to happen when you enter 0 into date?

Regards,
Jeff

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