previousMonth

Returns the HebrewMonth which came before this month, with the first being NISSAN and last being ADAR_II. If this is the first month, this will wrap around and return the last month (which would actually be part of the previous year). Note: this does not account for leap years and the presence of ADAR_II - it blindly gets the next month. In order to properly determine the previous month accounting for leap years and without wrapping, use getPreviousMonthInYear.