TIME & TIMEVALUE Formulas

Working with times in Excel can sometimes be tricky. A common problem happens when time clocks or attendance systems export times as plain text (like "08:15:00" or "04:45 PM"). If you try to subtract a text time from another time, Excel does not understand it and gives you a #VALUE! error.

To fix this, it helps to know how Excel sees time. In Excel, one full day (24 hours) equals the number 1. That means every time of day is just a decimal number between 0 and 1:

• 6:00 AM is 0.25 (one-fourth of a day)
• 12:00 PM (Noon) is 0.50 (half of a day)
• 6:00 PM is 0.75 (three-fourths of a day)

Excel has two simple formulas to help you work with times:

• TIME: Use this when you have hours, minutes, and seconds in separate cells and want to combine them into one time.
• TIMEVALUE: Use this when you have time stored as text words, and want to turn it into a real number that Excel can calculate.

Quick Comparison: TIME vs TIMEVALUE

Before writing formulas, look at how your time values are stored. If your sheet already separates hours and minutes into their own numbers, you need TIME. If your sheet has timestamps wrapped inside text from a CSV file, you need TIMEVALUE to turn them back into real numbers.

Once you convert or combine your times, Excel treats them as standard numbers. You can format them as 12-hour AM/PM or 24-hour military time using standard cell formatting, and use them directly in payroll math.

How to Use Each Formula

1. The TIME Formula

The TIME formula takes three numbers (hour, minute, second) and joins them together:

=TIME(hour, minute, second)

For example, if you have 8 in cell B2, 30 in C2, and 0 in D2, you write:

=TIME(B2, C2, D2)

Excel shows this as 8:30 AM. If you pass more than 59 minutes (like 75 minutes), Excel adds the extra 15 minutes to the next hour automatically.

2. The TIMEVALUE Formula

The TIMEVALUE formula changes text time into an Excel number:

=TIMEVALUE(text_cell)

It works with 24-hour time ("16:30:00") and 12-hour time ("4:30 PM"). Both give the exact same number (0.6875), so you can subtract or add them without errors.

Real-Life Examples

How to Find Total Work Hours

To find out how many hours someone worked, subtract the start time from the end time, then multiply by 24:

=(ClockOut - ClockIn) * 24

Why multiply by 24? Because Excel measures time in days. Multiplying by 24 changes days into hours. For example, if someone works from 8:00 AM to 4:30 PM, the result is 8.5 hours.

Night Shift Tip: Crossing Midnight

What if someone starts work at 10:00 PM and finishes at 6:00 AM the next day? If you just do 06:00 - 22:00, Excel gets a negative number and shows #####.

To fix this easily, use the MOD formula:

=MOD(ClockOut - ClockIn, 1) * 24

The MOD(..., 1) part handles the day change smoothly and gives you the correct 8 hours.

Try It Yourself: Spreadsheet Practice

Practice using both formulas in the interactive sheet below:

Objective 1: Make Start Time with TIME

In cell E2, combine the hour in B2, minute in C2, and second in D2 using the TIME formula.

Objective 2: Fix Text Time with TIMEVALUE

Marcus's punch time in cell F2 is text. In cell G2, convert it into a real Excel time using TIMEVALUE.

Objective 3: Make Afternoon Start Time

In cell E3, combine the afternoon shift time using Hour B3, Minute C3, and Second D3 with TIME.

Quick Summary

Working with times in Excel comes down to knowing what kind of data you start with. Use TIME when your hours, minutes, and seconds live in separate columns and you need to combine them into one standard shift time. Use TIMEVALUE when your time data arrives as plain text from an export and you need to convert it into a real number Excel can calculate.

Whenever you need to calculate total work hours from a time difference, subtract the clock-in time from the clock-out time and multiply by 24. For overnight shifts that cross midnight, wrap the subtraction inside MOD(..., 1) to avoid negative time errors.