Allow varied fiscal calendars, and allow the 13th period to be more than a day.
Some companies might have a 4 week period and the 13th period would need to be more than a day's worth.
This idea has been submitted to Product Development.
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David W Parvin commented
Good idea. You can do this now, The biggest issue is that from year to year, your fiscal calendar has to start on the same day of each year. As your years roll forward, what was a good logical breakup of the year becomes less so in the next year.
When you go in and setup your fiscal calendar you can change the dates to what ever you like, the code should follow it fine. To make it work correctly, you need to make sure that if you start year one on January 1, then the end date is December 31 and year 2's start date is January 1.
If you want to change it some other way, calculate the dates differently, please give some examples.