SLA to Date Time Picker type custom filed on transition with post function - Groovy inline script

[belphegro]

Hello,

I am trying to set the value of custom filed of Date Time Picker type to match the value of Time to resolution SLA.

I am trying to get it done in post function - Groovy inline script but I cannot get it working.

Can someone please give me an example script that would do this or let me know how I can get the endpoint value for specific SLA and how to change the value of a custom field as I don't have much experience with coding for Jira.

Kind regards,
Robert