Overnight Shift Hours Across Midnight
Add 24 to the end time to total a shift that crosses midnight, then see which workweek the after-midnight hours land in and whether they push you past 40.
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Disclaimer: This article is for educational purposes only and is not tax, legal, or financial advice. Labor rules can change and vary by state; always check current Department of Labor guidance or consult a qualified professional.
Quick Answer: How to Total a Shift That Crosses Midnight
When your clock-out time is smaller than your clock-in time, add 24 to the end time before you subtract. That’s the whole trick.
Formula: Hours = (End + 24) - Start - Unpaid Break
A 10 PM to 6 AM shift is (6 + 24) - 22 = 8 hours. Take out a 30-minute unpaid meal and you’re paid for 7.5 hours, which payroll writes as 7.50 decimal hours.
The arithmetic is the easy half. The half that decides your paycheck is which workweek those after-midnight hours land in, and that answer isn’t always the week your shift started.
Key Takeaways
- Add 24 to the end time. Or work in minutes past midnight and add 1,440 when the end is smaller than the start.
- Hours count in the workweek where they are actually worked. Under 29 CFR 778.104 and 778.105, each workweek stands alone and hours cannot be averaged across two or more weeks.
- ”The week the shift began” is a payment convenience, not the overtime rule. DOL Opinion Letter FLSA2005-17 allows it as a prepayment, with two conditions attached.
- A fixed boundary can legally split your shift. A boundary that moves week to week to keep you under 40 cannot.
- Daily overtime states run off a separate 24-hour workday. California’s workday boundary decides whether a 6 PM to 8 AM shift is one long day or two short ones.
- Daylight saving nights are 7 or 9 hours, not 8. You get credited for hours actually worked, not scheduled.
- Overnight work carries no federal premium. A night differential comes from policy or contract, never from the FLSA.
The Add-24 Rule, Step by Step
Clock math breaks on overnight shifts for one reason: the clock resets to zero at midnight, so a naive subtraction gives you a negative number. Adding 24 hours (or 1,440 minutes) to the end time puts both punches back on the same continuous timeline.
The minutes method
Working in minutes avoids fractions entirely, and it’s what payroll software does under the hood.
- Convert both punches to minutes past midnight. Multiply the hour by 60 and add the minutes. 10:00 PM is 22 x 60 = 1,320. 6:30 AM is 6 x 60 + 30 = 390.
- If the end is smaller than the start, add 1,440. 390 + 1,440 = 1,830.
- Subtract the start. 1,830 - 1,320 = 510 minutes.
- Subtract unpaid break minutes. 510 - 30 = 480 minutes.
- Divide by 60 for decimal payroll hours. 480 / 60 = 8.00 hours.
The minutes-to-decimal conversion is where most hand-written timesheets go wrong, because 8 hours 15 minutes is 8.25 and not 8.15. If your employer records punches on a 24-hour clock, our guide to military time on timesheets covers reading 2230 and 0645 without converting first.
Common overnight patterns
| Shift | Unpaid break | Paid time | Decimal hours |
|---|---|---|---|
| 10:00 PM to 6:00 AM | 30 min | 7h 30m | 7.50 |
| 11:00 PM to 7:00 AM | none | 8h 00m | 8.00 |
| 11:00 PM to 7:30 AM | 30 min | 8h 00m | 8.00 |
| 10:30 PM to 6:45 AM | none | 8h 15m | 8.25 |
| 6:00 PM to 2:30 AM | 45 min | 7h 45m | 7.75 |
| 7:00 PM to 7:00 AM | 60 min | 11h 00m | 11.00 |
For a single shift, the shift length calculator handles the midnight rollover for you. For a full week of graveyard shifts, the timecard calculator totals every punch pair and flags the overtime line.
One caution before you compare your math to your stub: your punches may have been rounded before payroll saw them. Rounding to the nearest quarter hour is legal within limits, and the 7-minute rule explains where the line sits.
Which Workweek Do the After-Midnight Hours Belong To?
Federal overtime is counted by the workweek, not by the day and not by the shift. Most calculator pages skip that distinction, and it is the one that decides overnight paychecks.
Under 29 CFR 778.105, your workweek is a fixed and regularly recurring period of 168 hours, seven consecutive 24-hour periods. It doesn’t have to match the calendar week. It can start any day, at any hour, and once your employer sets it, it stays put. Our FLSA workweek guide walks through how to find yours and what it takes to change it.
29 CFR 778.104 adds the counting rule: the Act takes a single workweek as its standard and does not permit averaging of hours over two or more weeks.
Put those together and the answer is plain. Hours you actually work at 12:30 AM on a Sunday belong to the workweek that contains 12:30 AM Sunday. Clocking in on Saturday evening doesn’t move them.
The folk rule, corrected
Search this question and you’ll repeatedly find some version of “all hours in a shift count in the workweek the shift began, that’s the DOL rule.” That inverts the actual guidance.
The source everyone is half-remembering is DOL Opinion Letter FLSA2005-17 (May 27, 2005). A Texas city asked whether it could include all hours worked in a single shift in the workweek in which that shift begins. The Wage and Hour Division said it had no objection, but framed it precisely: the employer would be paying in advance compensation the employee will be due in a subsequent pay period.
That’s a prepayment convenience: it changes when money reaches you, not how overtime is counted. The letter attaches two conditions in the same breath:
“employees must always be paid time and one-half their regular rate of pay for each hour actually worked over 40 hours in the workweek and the employer must not manipulate the schedule in order to avoid the overtime pay requirement of the FLSA.”
The same letter restates the counting rule directly: each workweek stands alone, averaging over two or more weeks is not permitted, and this holds whether an employee works a standard or a swing-shift schedule. So the start-week tally can move a payment forward, but it can never erase an overtime hour.
Why the Saturday-Night Shift Decides Whether You Hit 40
Most overnight shifts never touch the workweek boundary, so the split question never comes up. The one shift that does touch it is the last one before your workweek rolls over, and for a Sunday-start workweek that is Saturday night.
Say you worked 36 hours Monday through Friday, then a Saturday 10 PM to 6 AM shift. Two employers, two different workweek start days, one identical shift.
| Employer A: workweek starts Sunday | Employer B: workweek starts Monday | |
|---|---|---|
| Mon-Fri hours | 36 | 36 |
| Sat 10 PM to midnight | 2 (this week) | 2 (this week) |
| Sun midnight to 6 AM | 6 (next week) | 6 (this week) |
| Week total | 38 | 44 |
| Overtime hours | 0 | 4 |
Same hours, same body, different paycheck. The only variable is where an invisible line sits.
Four nights in a row, both weeks under 40
The opinion letter’s own fact pattern shows the sharper version. An employee works four consecutive 10 PM to 8 AM shifts, ten hours each, forty hours of work. The last shift straddles the boundary, with the first two hours falling in one workweek and the remaining eight in the following workweek.
Run that against a Sunday-start workweek, with the block starting Wednesday night, and the closing week collects 32 hours. The next week opens with 8. You worked forty hours across four shifts and neither workweek reached the overtime threshold.
That result is legal, and it surprises people. The split is a consequence of a fixed boundary, not a trick.
Where it stops being legal
The line is permanence. Under 29 CFR 778.105, a change to the beginning of the workweek is valid only if it is intended to be permanent and is not designed to evade overtime. FLSA2005-17 says the same thing in plainer words: the employer must not manipulate the schedule to avoid the overtime pay requirement.
So a boundary that has sat at Sunday 12:00 AM for years and happens to bisect your Saturday shift is fine. A boundary that migrates depending on how your hours are shaping up is not. If your workweek start seems to shift, ask payroll to put the fixed start day and hour in writing, then check it against several pay stubs.
Knowing your boundary is the practical takeaway. TimeClock44 has a per-job week start day setting, Sunday through Saturday, which is exactly the boundary this section is about, so after-midnight hours get allocated to the right week when the app checks you against 40. If you want to watch the threshold approach mid-week, the work schedule hours counter shows how many hours you have left before overtime starts.
Daily Overtime States: The 24-Hour Workday Is a Different Line
The workweek decides your 40-hour threshold. In a handful of states, a second and separate boundary decides your daily overtime: the workday.
California defines it in Labor Code section 500(a): a workday is any consecutive 24-hour period commencing at the same time each calendar day. Like the workweek, the employer picks the starting hour and then it stays fixed. Daily overtime runs at 1.5x for hours over 8 up to and including 12 in a workday, and 2x beyond 12.
For an overnight worker, that boundary is the difference between one long day and two short ones. Take a 6 PM to 8 AM shift, 14 hours:
- Workday starts at midnight. The shift splits 6 hours into one workday and 8 into the next. Neither exceeds 8, so no daily overtime and no double time.
- Workday starts at 6 PM. The shift is a single 14-hour workday. Hours 9 through 12 pay at 1.5x, and hours 13 and 14 pay at 2x.
Identical work, materially different pay. Our breakdown of California daily overtime covers the seventh-consecutive-day rules and the alternative workweek schedules that change this again.
Alaska, Nevada, Colorado, and Puerto Rico also have daily overtime rules, each with its own thresholds and exceptions, so the workday boundary matters there too. Check yours in the overtime rules by state reference before assuming the federal 40-hour rule is the only one that applies to you.
Don’t fuse the two questions. “Which day did my shift start” and “which workweek did my hours land in” are separate boundaries answering separate questions. Plenty of payroll disputes come from treating them as one.
Two Overnight Edge Cases: Breaks Across Midnight and the DST Night
Breaks that straddle midnight
A meal period from 11:45 PM to 12:15 AM gets the same treatment as the shift itself. Add 24 hours, or 1,440 minutes, to the break end time, subtract, and you get 30 minutes.
What matters more is whether it comes out of your paid total at all. Under 29 CFR 785.18, rest breaks of 20 minutes or less are compensable and stay in your hours. A bona fide meal period, ordinarily 30 minutes or longer with you completely relieved of duty, is not work time and comes out. A “meal break” where you stay at the desk to cover phones is not a bona fide meal period, and those minutes belong in your total.
The daylight saving night
Twice a year, a scheduled 8-hour overnight shift isn’t 8 hours.
- Spring forward, Sunday March 8, 2026. Clocks jump from 2 AM straight to 3 AM, so that hour never happens. An 11 PM to 7 AM shift is 7 actual hours.
- Fall back, Sunday November 1, 2026. Clocks fall back from 2 AM to 1 AM, so the 1 AM hour runs twice. The same shift is 9 actual hours.
The DOL elaws Hours Worked Advisor states the rule with no wiggle room: the FLSA requires that employees must be credited with all of the hours actually worked. On the fall-back night you worked nine hours and you’re owed nine, even though the schedule says eight.
That extra hour is worth watching, because it’s a classic way to cross 40 without noticing. If your week was already at 39, the November changeover puts you into overtime by itself.
One thing overnight hours do not automatically get
A premium. Federal law requires no extra pay for night, weekend, or holiday work. A shift differential exists because your employer’s policy, your offer letter, or your union contract created it.
When you do earn one, it isn’t a side payment: it folds into your regular rate before overtime is calculated, which raises your overtime rate above 1.5 times your base wage. The details are in our guide to shift differential pay, and the mechanics of the blended rate are in regular rate of pay.
Related Reading
- FLSA Workweek Definition: How Your 7-Day Clock Is Set. How the 168-hour workweek is established, why it differs from your pay period, and how to find your own boundary.
- California Daily Overtime: 8-Hour Day Rules. Daily overtime, double time, and the seventh-day rules that overnight workers hit most often.
- Shift Differential Pay 2026: Night Premiums. What a differential is worth, who sets it, and how it changes your overtime rate.
- 2-2-3, Pitman and DuPont Schedules: A Worker’s Hours Guide. How rotating patterns land on your workweek boundary and where the overtime shows up.
- Night Shift Health: How to Stay Well on Odd Hours. Sleep, light, and meal timing strategies for people whose workday starts at 10 PM.
References
- DOL Opinion Letter FLSA2005-17 (May 27, 2005). Wage and Hour Division guidance on shifts that cross the workweek boundary, the prepayment allowance, and the two conditions attached to it.
- 29 CFR 778.104: Each Workweek Stands Alone. The rule that overtime is measured one workweek at a time, with no averaging across two or more weeks.
- 29 CFR 778.105: Determining the Workweek. Defines the fixed, regularly recurring 168-hour workweek and the conditions for changing its starting point.
- DOL elaws Hours Worked Advisor: Daylight Saving Time. Official examples showing the 7-hour and 9-hour results on the changeover nights.
- California Labor Code Section 500. Statutory definitions of workday and workweek that drive California daily overtime.
- California DIR: Overtime FAQ. Daily overtime after 8 hours, double time after 12, and the seventh-consecutive-day rules.
- 29 CFR 785.18: Rest Periods. Establishes that breaks of 20 minutes or less are compensable work time.
- DOL: Night Work and Shift Work. Confirms the FLSA requires no premium for night, weekend, or holiday hours.
- DOL Fact Sheet #22: Hours Worked Under the FLSA. What counts as hours worked, including breaks, waiting time, and on-duty meal periods.
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Frequently Asked Questions
Does an overnight shift count on the day it starts or the day it ends?
For federal overtime, neither framing controls. Hours count in the workweek in which they are actually worked, so a shift that crosses your workweek boundary is split between two workweeks. Some employers tally the whole shift into the week it began as a payroll convenience, which the Department of Labor permits as a prepayment arrangement, but that shortcut can never reduce the overtime you are owed for hours actually worked past 40 in a workweek. Daily overtime in states like California is a separate question, decided by the employer's fixed 24-hour workday.
How do I calculate hours from 10 PM to 6 AM on a timesheet?
Add 24 to the end time before subtracting, so (6 + 24) minus 22 equals 8 hours. If you took a 30-minute unpaid meal, the paid total is 7.5 hours, which payroll records as 7.50 decimal hours. The same logic works in minutes: 10 PM is 1,320 minutes past midnight and 6 AM is 360, so 360 plus 1,440 minus 1,320 gives 480 minutes.
Which workweek do midnight-crossing hours count toward for overtime?
The one that actually contains them. Under 29 CFR 778.104 and 778.105 your workweek is a fixed 168-hour period set by your employer, each workweek stands alone, and hours cannot be averaged across two or more weeks. If your workweek starts Sunday at 12:00 AM, the hours you work from midnight onward on a Saturday-night shift belong to the following workweek.
Can my employer count all of a midnight-crossing shift in the week it started?
Yes, for payment purposes. DOL Opinion Letter FLSA2005-17 says the Wage and Hour Division has no objection to an employer paying in advance for hours that fall in the next week by including the whole shift in the starting workweek. The letter attaches two conditions: you must still be paid time and one-half for every hour actually worked over 40 in a workweek, and the employer must not manipulate the schedule to avoid overtime.
How many hours is a night shift on the daylight saving time changeover?
Not the scheduled eight. On the spring-forward night, March 8, 2026, an 11 PM to 7 AM shift is seven actual hours. On the fall-back night, November 1, 2026, the same shift is nine. The DOL Hours Worked Advisor is explicit that employees must be credited with all of the hours actually worked, so the extra fall-back hour is paid, and it can be the hour that pushes you past 40.
Do I get extra pay for working overnight?
Not under federal law. The FLSA sets no premium for night, weekend, or holiday hours, so a shift differential is a matter of employer policy, an offer letter, or a union contract. Where a differential does apply, it usually has to be folded into your regular rate before overtime is calculated, which raises your overtime rate.
How do breaks that cross midnight get handled?
The same way the shift does. Add 24 hours, or 1,440 minutes, to the break end time before subtracting. Rest breaks of 20 minutes or less are paid time under 29 CFR 785.18 and stay in your total. A bona fide meal period of 30 minutes or more, with you fully relieved of duty, is unpaid and comes out.
Why didn't my overnight hours push me over 40?
Most often because the shift straddled your workweek boundary and the hours were divided between two weeks, leaving each one under 40. That split is legal when the boundary is fixed and recurring. What is not legal is moving the boundary week to week to keep you under the threshold, because a change to the start of the workweek has to be intended as permanent and cannot be designed to evade overtime.