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SpaceBooker is a powerful off- and online booking software for hostels, fairs, villages, rent-a-car and similar places with graphical booking needs. With it's graphical Front Desk software is packed with high usability unusual for a database product
Some utility function and/or class to convert date from Gregorian calendar to Jalali (Hejri Shamsi) calendar in PHP, Delphi (and some other in future) with very fast algorithm.