Returns the hour corresponding to serial_number. The hour is given as an integer, ranging from 0 (12:00 A.M.) to 23 (11:00 P.M.).
Serial_number is the date-time code used by Microsoft Excel for date and time calculations. You can give serial_number as text, such as "16:48:00" or "4:48:00 PM", instead of as a number. The text is automatically converted to a serial number. For more information about serial numbers, see NOW.
Note Microsoft Excel for Windows and Microsoft Excel for the Macintosh use different date systems as their default. For more information, see NOW.
HOUR(0.7) equals 16
HOUR(29747.7) equals 16
HOUR("3:30:30 PM") equals 15