# Excel HOUR Function

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.

**serial_number**- A valid Excel time.

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

You can use the HOUR function to extract the hour into a cell, or 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:

Times can be supplied as text (e.g. "7:45 PM") or as decimal numbers (e.g. 0.5, which equals 12:00 PM). In general, it's best to use the TIME function to create time values, because it reduces errors.

*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.*