It's 1308 in Phoenix. What is the local time in Berlin (1008).
That is 22:08 Berlin time btw, not 10:08.
All I have is the time code and offset of Berlin. CEST and 7200,1.
Again, see winni's answer in case you wish to keep it simple.
Phoenix UTC offset = -7
Berlin UTC offset = +2
Therefor the time difference is 7 (from -7 to 0) + 2 = 9 hours.
13:08 + 9 = 22:08
My calculations come into play when you need to calculate the duration of a flight, which should again be done in UTC time because that is able to provide you with an absolute (duration) value (which is the actual duration of a flight).
You really should try to avoid using local times as much as possible as they do not mean anything. You could just as well state that it is ten pieces of pie later in Berlin then it is in Phoenix. The time difference only exist because humanity decided once that when the sun is at its highest point in the sky it is noonish and that should be the same everywhere in the world (well actually daylight saving time and some other technicalities and politics prevents that from actually being the case).
As of winni's suggestion to build yourself a clock, you can take a peek here:
https://time.is/1308_6_Aug_2020_in_Phoenix/Berlin (you can change the places and other settings on the main page.