I can't change date in tally educational version?

Dear Friend,

When Tally is in educational mode, you can only enter 1st & 2nd of any month from Jan to Dec counting to 24 days + 31st of any month i.e. 7 Days (wiz. 31st Jan, 31st Mar, 31st May, 31st July, 31st Aug, 31st Oct & 31st Dec) totaling up to 31 days during entire 365 Day in a year period.

you may try with any of this dates & you can work for full fledge working in tally you need to purchase the software

Regards