How to use a scripted field to take in value (date) from another field (date) ?

[Aisha M]

I want to create a scripted field, which is supposed to take in a date value from another date picker field if left blank, also this field must also let the users to select a date value too if needed.

Any help on how to achieve this using script-runner ? I have never worked with groovy scripts.

[Nic Brough -Adaptavist-]

A scripted field is not suitable here.  They are derived by code and are therefore read-only, your users will not be able to select a date.

I would have another look at the requirement too - effectively, you seem to be asking for a simple date field, enterable by the users, no code needed.  Could you explain what the goal is?  What does the end user see from the field?