In tally there is no option to control voucher date to computer date. So users can give any date on voucher creation or alteration mode. In some cases this is more critical and major issues comes where invoice or receipt vouchers are made on wrong date by mistake.
Use of this TDL
Enabling this tdl, during voucher creation, voucher date will linked to the computer date. And permission to modify voucher date can be enabled either at Voucher Type Level or User Level.