This module allows you to calculate the day, week, period or quarter of a date in a fiscal year, given a start date and either a target date or number of periods and target date. This is often needed in business, where the fiscal year begins and ends on different days than the calendar year. This module is based on the Gregorian calendar. Using other DT calendar objects will return results, but the behavior is unpredictable for calendars that have more than 365 or 366 days. WWW: http://datetime.perl.org/