Does the time difference between Berlin and Dubai change during the year?

Yes. Because of daylight saving time the gap moves between −3h and −2h.

When is the best time to call Dubai from Berlin?

Between 09:00 and 15:00 in Berlin, which is 11:00 to 17:00 in Dubai.

Berlin is 2h behind Dubai. This gap is not fixed: daylight saving time moves it between −3h and −2h during the year.

Berlin

Germany

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Dubai

United Arab Emirates

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A 9-to-5 day in each city overlaps for 6h. That is 09:00–15:00 in Berlin, which is 11:00–17:00 in Dubai.

City	Time zone	UTC offset
Berlin · Germany	Europe/Berlin	UTC+2
Dubai · United Arab Emirates	Asia/Dubai	UTC+4

What is the time difference between Berlin and Dubai?: Berlin is 2h behind Dubai. This gap is not fixed: daylight saving time moves it between −3h and −2h during the year.
Does the time difference between Berlin and Dubai change during the year?: Yes. Because of daylight saving time the gap moves between −3h and −2h.
When is the best time to call Dubai from Berlin?: Between 09:00 and 15:00 in Berlin, which is 11:00 to 17:00 in Dubai.