Why is the voucher showing last voucher date instead of today date?
To set date you can follow some steps:
Step 1: Go to administration and then click on Configuration.
Step 2: Now click on voucher series configuration and select voucher type in which you want correct date.
Step 3: Now click on voucher series and select voucher configuration.
Step 4: Now select system date in Set Default Date in voucher as Option and save the configuration.