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Time limitations using formulas

Time limitations using formulas: Excel 2016: Data Validation in Depth
Time limitations using formulas: Excel 2016: Data Validation in Depth

Data Validation's Time option doesn't cover all time definitions, like minutes and comparing time entries in other columns. Use the Custom option to combine various time restrictions, e.g., use =AND(HOUR(B1)>=8, MOD(MINUTE(B1,15)=0) to restrict all entries to be from 8 AM and onward and be a 15 minute interval (8:45, 9:30, etc.)

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