Frappe date functions


i want to add new doc with 1 expiry column that automatically set 3 month after posting date
i wonder how i can do this

is there any fucntion to do this?

Try using python dateutil and relativedelta

can you give an example ?..
i have no idea how to use it without example or furhter explanation about the param and the return


ohhh isee…so have to use python code because there is no frappe method for this…