- serial_number – A valid time in a format Excel recognizes.
Times can be supplied as text (e.g. “7:45 PM”) or as decimal numbers (e.g. 0.5, which equals 12:00 PM).
Excel stores dates and times as serial numbers. For example, the date Jan 1, 2000 12:00 PM is equal to the serial number 32526.5 in Excel. To check that Excel is correctly recognizing a date or time, you can temporarily format the date as a number.