Interprets the year/month specified in the user preferred calendar and returns the number of days in a that month.
userdaysinmonth( month, year )
month: (Number) The month for which days are requested.
year: (Number) The year for which days in month is requested.
Number
You can copy and paste these examples into the Expression Rule Designer to see how this works.
userdaysinmonth(04,2006)
returns 30