I'm so rusty at this! Could someone remind me how I get the difference
between two columns of Times please? I'm using familiar hours and minutes.

Col A Col B Col C
12:04 12:34 00:30 <--- How do I get this '00:30'?
16:35 18:34 01:59 etc

What cell format do I apply after typing in the data as say HH:MM? And
what function do I use for the result in Column C please?

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Terry, East Grinstead, UK