Automatic date field set based on another date field - how to?

[TamasS]

Hi Everyone,

we'd need an automation which sets a date field based on another manually given date field.

More specifically:

We add a Start Date manually and then the Planned Delivery Date field will be set as Start Date + 30 days.

Is there a post function or anything else that makes is possible?

Thanks in advance!

[Krisztian Kovacs]

Hi @TamasS,

that sounds like a Scriprunner script to me:

1. Take date from one field
2. Override another field

This might be helpful, but it's not a post function: https://community.atlassian.com/t5/Jira-Core-questions/add-days-to-date-by-behaviour-or-script-runner/qaq-p/309560

Using behaviour would result in less of a strain on the system as when the issue is created/edited Jira would handle custom field data anyways, post functions add more to that.

Let me know if this is somewhat helpful. There are other examples out there using post-functions.