Hi,

I am new to grid4php.

I have a date field called mailing_date

A user will enter a date in here.

Once they enter this I would like to then set two other fields

twenty_one_date = mailing_date + 20 days

forty_two_date = mailing_date + 41 days

E.g.

Mailing date = 2026-02-26

twenty_one_date = 2026-03-18

forty_two_date = 2026-04-08

If possible I would ideally like these updating before the user gets to the fields on the form so they can if required change them – but the fields would automatically contain these values?

Is this possible and how please?

thanks

Lucy