TIMEVALUE function
Description
TIMEVALUE(str) converts a time string (in "hh:mm" format) to a serial time number. A serial time number is a number ranging from 0.00 to 1.00 representing the time 0:00 to 24:00.
Examples
TIMEVALUE("06:30") returns 0.27084
TIMEVALUE("12:00") returns 0.5
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