Did you have a great time? vs Have you had a great time?

[GeoTop]

Difference between these two sentences:

"Did you have a great time?"

"Have you had a great time?"

[Mister Micawber]

.
The second enquiry refers to an adventure still in progress, or possibly very recently completed.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[GeoTop]

[Mister Micawber]

.
Your sentence with the progressive only refers to an adventure still in progress.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber