Can you restrict columns to write only time/contact?

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I know that we are able to restrict columns to write contacts only. However, for some reason even if I have the contacts listed, they still write down their email instead of selecting the contact drop down lists. Why is it not restricting properly?

How would you restrict a certain column for the person to input time only (AM/PM only) format? I want to prevent people from typing in dates in that specific column instead of typing the date or anything else/military time.

Thank you for your time and help!

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