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Excel HOUR Function

Excel HOUR function
Summary 

The Excel HOUR function returns the hour component of a time as a number between 0-23. For example, with a time of 9:30 AM, HOUR will return 9. You can use the HOUR function to extract the hour into a cell, or feed the result into another formula, like the TIME function.

Purpose 
Get the hour as a number (0-23) from a Time
Return value 
A number between 0 and 23.
Syntax 
=HOUR (serial_number)
Arguments 
  • serial_number - A valid Excel time.
Version 
Usage notes 

The HOUR function returns the hour portion of a time as a number between 0-23. For example, with a time of 9:00 AM, HOUR will return 9. HOUR takes just one argumentserial_number, which must be a valid Excel date or a valid Excel time.

Times can be supplied to the HOUR function as text (e.g. "7:45 PM") or as decimal numbers (e.g. 0.5, which equals 12:00 PM). To create a time value from scratch with separate hour, minute, and second inputs, use the TIME function.

The HOUR function will "reset" to 0 every 24 hours (like a clock). To work with hour values larger than 24, use a formula to convert time to decimal hours.

Example #1 - Hour from time

The HOUR function returns the hour from of a time or date as a number between 0-23. For example:

=HOUR("9:00 AM") // returns 9
=HOUR("9:00 PM") // returns 21

Example #2 - Minutes ignored

The HOUR function ignores minutes and seconds. For example, when given the time "6:30 PM", HOUR returns 18:

=HOUR("6:30 PM") // returns 18

Example #3 - Hour from date

Some Excel dates include time. When given a date that includes time, the HOUR function will extract the hour and ignore the date. For example, with 29-May-2021 6:00 AM in cell A1:

=HOUR(A1) // returns 6

The date portion of the value is ignored completely. If the date contains no time value, HOUR returns 0 (zero) which is midnight.

Example #4 - with TIME function

You can use the HOUR function to extract the hour and feed the result into another formula, like the TIME function. For example, with the time "8:00 AM" in A1, you could force the time to be on the half-hour with:

=TIME(HOUR(A1),30,0) // returns 8:30 AM

Note: 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.

Notes

  • HOUR returns #VALUE! if serial_number is not recognized as a valid date or time.
  • HOUR returns #NUM! if serial_number is out of range.

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