You set the date using the left half of the tab. Simply choose your month and year using the controls at the top of the calendar and the day of the month by clicking on the day in the calendar.
Datum nastavite v levi polovici modula. Izbrati morate le mesec (spustno polje na vrhu), leto (vrtilno polje na vrhu) in dan v mesecu (kliknite na datum v koledarju).