How To validate the date of the instance When Submitting a ticket

[ShowMWUGot]

Can someone help to complete submitting new case, I’m struggle to know what is the accurate way to pass this question.

When did this happen?

I tried to many time but unfortunately no luck

[FullCafLizard]

When you click in that box a calendar box is supposed to pop up:

Is this not happening for you?

[ShowMWUGot]

unfortunately

[ShowMWUGot]

BTW thank you for your response