Please help with reminder script

Hi All,

Could someone help me with the script for a expire date in a form or table?

what I want to do is 30 days before the saved date a reminder is emailed, that within 30days the component will expire.

e.g. the expire date is 30/02/2022 email reminder send automatically for 30days before the expiry date of 30/02/2022.

I would be really thankful if someone could help, please.

Regards
Wayne