Trouble setting Date/Time field with GlideDateTime in Transform Map Script

[Gagana B N1]

Hi all,

I’m working on a data import in ServiceNow and I’m having issues updating a Date/Time field (u_due_date) using a field script in a Transform Map. My goal is to convert a date string from the import set to a valid Date/Time value in the target table.

Here’s my current script in the field map:

answer = (function transformEntry(source) {

var duedate = new GlideDateTime();

duedate.setDisplayValue(source.u_due_date);

 // Set as needed (YYYY-MM-DD HH:mm:ss)

var date = duedate.setDisplayValue(source.u_due_date);

return date;

})(source);

Source data example:
2025-11-18 14:30:00 (as a string in the import set)

Issue:
The u_due_date field is not being updated after the transform runs—no errors, but the value isn’t set in the target record.

What I’ve checked:

• The field is of type Date/Time.
• The source data string matches the expected format (YYYY-MM-DD HH:mm:ss).
• No errors in the logs.

Question:

What am I missing or doing wrong when converting and returning a GlideDateTime in a Transform Map field script? Is there a better or safer way to do this conversion so the field is reliably updated?

Thanks in advance for your help!

[Gagana B N1]

@Ankur Bawiskar 

I have tried this way too still not working

Regards,

Gagana

[Ankur Bawiskar]

@Gagana B N1 

Sorry but it should work and it has worked for many of us in the past over the years.

you need to debug it further as we don't have access to it.

what if you hard-code the field in transform script?

If it still doesn't work then please check if that field is read-only at dictionary or any data policy is blocking

(function runTransformScript(source, map, log, target /*undefined onStart*/ ) {

	// Add your code here
	target.setValue('u_due_date', new GlideDateTime());

})(source, map, log, target);

💡 If my response helped, please mark it as correct ✅ and close the thread 🔒— this helps future readers find the solution faster! 🙏