Returns a timestamp resultant of adding n months to timestamp t.
Use this function instead of simply adding
n * {MONTH}, since
{MONTH}is a macro equivalent to
30 * {DAY}. Negative values for n are used in order to subtract instead of adding.
Syntax
addMonths(number t, number n, timeZone time_zone) #Output: number
In this function we are not taking into consideration the fact that some months have more or less than 30 days.
