Returns the date for the last day of the month that is the number of months before or after the given starting date in the user preferred calendar.
usereomonth( starting_date, months )
starting_date: (Date) The starting date.
months: (Number) The number of months to offset, where negative is before starting_date and positive is after start_date.
You can copy and paste these examples into the Expression Rule Designer to see how this works.
usereomonth(11/27/06, -6) returns