I don't remember exactly how to do that but I think it is easy to do using timepicker component. A few time ago I found a very good example on the gallery, search for timepicker there and you will probably find it.
When I arrive home I can give you a hand if you don't succeed.
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It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.
I do not know whether it is simpler. In any case, it is different.
From my count-down-to-2016 in the gallery, http://ai2. appinventor.mit.edu/# 6702056039776256
Here is the relevant procedure:
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