"Let the good times roll" in Farsi?

does it really have to be the direct translation of a cajun expression :-D

in persian "saa'at" means clock or hour, but time would be "zaman". however, we dont use those exact words in this context.

Just say "omidvaaram khosh begzareh" which literally goes "i hope it goes well (or fun)" or simply "khosh begzareh" which is slightly less formal (i just took out the "i hope" part, in french it'd be "qu'il se passe bien").

you can also say "oghateh khoobi dashteh bashi". which means "may you have good times" but its more formal than "omidvaaram khosh begzareh".

but as for your question on the structure, yes we would say "time good" instead of "good time".

So if it means "Have a great time"

Omidvaram oghate khoobi ro separi konid"

Or if it is "Have fun!"

Means: "Khosh begzare!"