Military Time Conversion for Timesheets: The Simple Guide

What Military Time Is (and Why Your Timesheet Uses It)

Military time, more formally the 24-hour clock, counts the day straight through from 0000 to 2359 without resetting at noon. There is no AM or PM and no colon on most time clocks. The day starts at 00:00 (midnight) and the last minute of the day is 23:59.

The format exists to remove ambiguity. “12:00” and “7:30” can each mean two different times on a 12-hour clock, but 0000 and 1930 can each mean only one. That precision is why you see 24-hour time in healthcare, logistics, aviation, security, and warehousing, and why so many punch clocks and timekeeping systems record shifts that way.

The catch is that your time clock speaks 24-hour time while your brain (and your pay stub) probably think in AM and PM. The gap between those two is where workers get unsure whether their hours are right. First you read the timesheet. Then you total it correctly.

The Conversion Rule in One Minute

You only need two moves to convert in either direction. The minutes are along for the ride: they never change.

Military to standard

• 0000 to 1259: read it almost as-is. Drop the leading zero, add AM. 0930 is 9:30 AM. 1215 is 12:15 PM (noon and the hour after are the one quirk).
• 1300 and up: subtract 12, add PM. 1300 is 1:00 PM. 1645 is 4:45 PM. 2300 is 11:00 PM.

Standard to military

• AM times: keep the hour, pad to four digits. 7:05 AM is 0705. 11:50 AM is 1150.
• PM times: add 12 to the hour. 4:00 PM is 1600. 9:30 PM is 2130.

The midnight edge case

Midnight has two valid forms. Under ISO 8601, 0000 is preferred for the start of a day, while 2400 marks the end of a day. Most time clocks log a midnight punch as 0000. If you ever see 2400 on a record, read it as the very end of that date, equal to 0000 of the next.

Noon is the other one people second-guess: 1200 is 12:00 PM, no subtraction needed. Subtraction only kicks in at 1300.

Full Military Time Conversion Chart

Here is every hour mapped to its 12-hour equivalent. Scan it, screenshot it, or print it and tape it next to the clock. Remember that the minutes carry straight across unchanged.

Minutes example: 1345 is 1:45 PM, 0815 is 8:15 AM, and 2230 is 10:30 PM. The hour follows the chart; the minutes stay put.

Worked Example: Totaling a Shift (Clock In 1345, Clock Out 2215)

Reading the times is half the job. The other half is adding up the hours the way payroll does it. Here is a full shift from punch to total.

Step 1: Convert each end of the shift

• Clock in 1345: 13 minus 12 is 1, so this is 1:45 PM.
• Clock out 2215: 22 minus 12 is 10, so this is 10:15 PM.

Step 2: Turn the minutes into decimals

Payroll math runs on decimal hours, not hours-and-minutes. Divide the minutes by 60.

• 45 minutes: 45 / 60 = 0.75, so 1345 becomes 13.75.
• 15 minutes: 15 / 60 = 0.25, so 2215 becomes 22.25.

Step 3: Subtract start from end

22.25 - 13.75 = 8.5 hours

That shift is 8.5 hours, or 8 hours and 30 minutes. Notice how converting to decimals first made the subtraction clean. Trying to subtract 13:45 from 22:15 in hours-and-minutes is where people trip.

Midnight-crossing variant (clock in 2200, clock out 0600)

Night-shift punches roll past 0000, so straight subtraction gives a negative number. Split the shift at midnight instead.

• From 2200 to midnight (2400): 24 minus 22 = 2 hours.
• From midnight (0000) to 0600: 6 hours.
• Total: 2 + 6 = 8 hours.

If you would rather not split it by hand, a shift length calculator handles the midnight crossing for you, and a time card calculator totals a full week of punches.

From Hours to Your Paycheck: The Decimal Step

Here is why the decimal step matters: your pay is decimal hours times your hourly rate. Get the decimals wrong and your gross pay is wrong.

Take that 8.5-hour shift at $20/hour: 8.5 x $20 = $170. Now watch the trap. If you (or a payroll clerk) wrote the shift as “8.30” hours by mistake, the math becomes 8.30 x $20 = $166, shorting the shift by $4. Repeat that across a week or a crew and it adds up fast.

The 8.30-versus-8.50 trap

Thirty minutes is half an hour, and half of one is 0.50, not 0.30. Writing “8.30” treats the minutes as if they were already a decimal, which they are not. This is the single most common manual payroll error, and it always favors a smaller paycheck.

• 41 hours 15 minutes is 41.25 hours, not 41.15.
• 37 hours 45 minutes is 37.75 hours, not 37.45.

When a whole week is in play, a payroll time converter turns your hours and minutes into clean decimals so the multiplication is reliable.

Spot-checking overtime past 40

Once your weekly hours are in decimals, the overtime check is easy. Hours over 40 in the workweek are paid at 1.5 times your rate under federal law. If you logged 46.5 decimal hours, that is 40 straight plus 6.5 overtime. Run the numbers through an overtime calculator if you want the premium math done for you.

Avoiding the Common Mistakes

Most timesheet errors are not the conversion itself but the small things around it.

Forgetting unpaid breaks

If your 8.5-hour shift includes a 30-minute unpaid lunch, your paid time is 8.0 hours, not 8.5. Deduct unpaid breaks before you multiply by your rate, or you will expect more than the stub shows.

Mishandling midnight

On overnight shifts, never subtract the raw numbers (0600 minus 2200 gives a meaningless negative). Split the shift at midnight and add the two pieces, as shown above.

The minute-to-decimal slip

Always divide minutes by 60. The four anchors worth memorizing: 15 = 0.25, 30 = 0.50, 45 = 0.75, and 60 = a full hour. Anything else, just divide.

Rounding rules

Some employers round punches to the nearest quarter hour. Under the historical DOL practice, time of 1 to 7 minutes can be rounded down, while 8 to 14 minutes must be rounded up to the next quarter hour. Rounding has to be neutral over time, so an employer cannot always round in its own favor. The DOL has signaled that rounding is increasingly disfavored, but you should still be able to check it. Our guide to timesheet rounding and the 7-minute rule walks through it, and a time clock rounding calculator shows how a punch rounds.

Know your recordkeeping rights

The Fair Labor Standards Act does not require a particular timesheet format, but it does require your employer to record the hours you work each day and the total each workweek, and to keep those records for at least two to three years. The details are in DOL Fact Sheet #21. If your punches look off, you are entitled to an accurate record to check them against.

If doing this math by hand every shift wears thin, that is exactly the chore Timeclock44 takes off your plate: it reads shift times, handles the midnight crossing, and totals the hours so you can confirm your pay instead of recalculating it.