period generation

[phil]

The code is all there so you can see for yourself - care is taken to ensure that the code is as readable as it possibly can be.

The function GetPeriod($Some_Given_Date, $db) in the file includes/DateFunctions.inc is responsible for figuring out which period a date belongs in ... if the date belongs in a period subsequent or prior to the defined periods then new periods are defined and inserted into the database.