The value of the target start field cannot be copied to the date time custom field.

[소프트웍스 박상민]

Hello.
I referred to the script on the page below.

https://community.atlassian.com/t5/Jira-questions/Can-not-Copy-Due-date-into-Target-End-Field/qaq-p/1184920

Duedate has been changed to Datetime customfield.
However, the value is not copied.
I want to copy the value of the Target start field to Datetime custom field.
What can I do?