Date field is not setting properly through script include

[MihirY]

I am trying to update date time field in the project management task table. When I check the view xml of that record, date is showing as expected but when I see in the record value is coming different. I think issue towards the timezone but I am not able to identify fix. I want to set the date as 21st May but it is visible as 20th May.

I am updating the record with below code

var endDate = new GlideDateTime(_date);
endDate.addDaysUTC(25);
gr.setValue("end_date",endDate); //assume here gr is already existed

[Shruti]

var dt = "2025-05-20 20:00:00";
var tz = gs.getSession().getTimeZoneName();
var gdt = new GlideDateTime(dt.toString());
gdt.setTimeZone(tz);
var end_date = gdt.getDisplayValueInternal();
gs.info(end_date);

[MihirY]

I need to add the days to the date and need to set to end_date field. Your code doesn't match with that.