How to say "clock" and "o'clock" in German

Basic German: Beginner students of German are often confused by the words “Uhr” (“o’clock” or simply “clock”), “Stunde” (“hour”) and “Zeit” (“time”).
If that describes you, check out these sentences to make sense of it all:
“In einer Stunde ist es 12 Uhr.”
(“In one hour it’s 12 o’clock.”)
“Die Zeit ist 12 Uhr.”
(“The time is 12 o’clock.”)
“Ich habe noch eine Stunde Zeit.”
(literally “I still have one hour of time.”, i.e. “I have time for one more hour.”)
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