The difference between similar characters in both modes should be noticed. Semicolon, comma, decimal point and question mark are examples of these characters. The default start day is expected to be Saturday. Default weekend days are Thursday and Friday. The date can be chosen to be either Gregorian or Hijri.
Hijri date needs special formulas.
In Hijri date, Arabic months should be used. Display of all material should be from right to left. The same should be true for months display. The first month of the year should be at the upper right corner and the last month should be at the bottom left corner. In both cases day numbers are expected to run in increasing order from right to left.