How to set the clock on a 4th gen. Honda civic?

My car is a 1989 honda civic DX hatchback. The unit is both a radio and a clock.
I can't figure out how to set the clock.
Any help would be greatly appreciated!

Try pressing and holding clock button, then press tune up/down to adjust time, or press forward or rewind.
Don't remember exactly, but I do remember you need to hold the clock button while pressing another button.

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