Hi autoit community. As the language used in our country is Persian (Farsi) and our calendar type is not Gregorian but instead it is Shamsi(Jalali), I want to create a custom input date,  because of the difference between our calendars. For example we celebrate beginning of our new year on 20th of march, so there is much difference.  So I wanted to create a custom GUI with our regional dates and I don't want to use system's default or changed calendar, the math part and the if statements is