Daylight Saving Time and Your Night Shift: How Many Hours Did You Actually Work? (Fall Back and Spring Forward Math)

Two nights a year, an overnight shift stops matching the schedule. In the fall the clocks go back and the shift is an hour longer than printed. In the spring they jump forward and it is an hour shorter. The roster still says "11 p.m. to 7 a.m.", but the hours actually worked are different, and so is the weekly total that overtime depends on.

In 2026 the fall change lands on Sunday, November 1: at 2:00 a.m. clocks go back to 1:00 a.m. This post is the arithmetic for that night and for the spring one, and what to look at on your pay stub afterward.

The rule of thumb: count elapsed time, not clock-face time

The federal wage law is built on hours actually worked. Overtime is counted per workweek, which 29 CFR § 778.105 defines as "a fixed and regularly recurring period of 168 hours" (seven consecutive 24-hour periods). A clock change doesn't change how long you were on the job; it only changes what the wall clock says at the start and the end.

So for a shift that crosses the change:

Hours worked = clock-out − clock-in, corrected by the clock change (+1 hour in the fall, −1 hour in the spring) − any unpaid meal

(If you haven't done the across-midnight version of the math before, calculating hours worked on a shift that crosses midnight covers the basic subtraction first.)

Fall back: the 1:00 a.m. hour happens twice

On the night clocks go back, 1:00 to 2:00 a.m. is lived through twice, once on daylight time and once on standard time. Someone working straight through works both.

Only shifts that are in progress at 2:00 a.m. are affected. An evening shift that ends before the change, or a day shift that starts after it, is its normal length.

Spring forward: the 2:00 a.m. hour never happens

When clocks jump from 2:00 a.m. to 3:00 a.m., that hour doesn't exist. In 2027 that is Sunday, March 14. The same 11 p.m. to 7 a.m. shift is 7 hours of real time, and the 7 p.m. to 7 a.m. shift is 11 hours.

This is the one that causes the most arguments. Some employers pay the scheduled shift length anyway. Others pay the hours the timeclock recorded. Which one applies to you is a matter of your employer's pay policy, any union agreement, and state law, not of the clock itself.

Worked example 1: the extra hour pushes a week past 40

A hospital-supply worker is paid $22/hour and works five 11 p.m. to 7 a.m. shifts a week with a paid (on-duty) meal, so each normal shift is 8 hours. The workweek includes the fall-back night.

• Normal week: 5 × 8 = 40 hours, no overtime. Pay: 40 × $22 = $880
• Fall-back week: 4 × 8 + 9 = 41 hours
• Hour 41 is past 40, so it is overtime at 1.5 × $22 = $33
• Correct pay: 40 × $22 + $33 = $913

If the pay stub still shows 40 hours and $880, the missing hour is worth $33, not $22, because of where it falls. The same idea shows up when you pick up extra shifts: see overtime when two pay rates are involved if your night shifts carry a differential.

Worked example 2: 12-hour nights with an unpaid meal

A call-center agent earns $18/hour and works three 7 p.m. to 7 a.m. shifts a week, with a 30-minute unpaid meal on each.

• Normal shift: 12 − 0.5 = 11.5 paid hours; week: 3 × 11.5 = 34.5 hours
• Fall-back night: 13 − 0.5 = 12.5 paid hours
• Fall-back week: 2 × 11.5 + 12.5 = 35.5 hours, still under 40, so the extra hour is paid at straight time: 1 × $18 = $18

Now suppose the same agent also picked up a fourth night that week, which is 4 normal-length shifts = 46 hours without the clock change. With the fall-back night in the week the total is 47 hours, so 7 overtime hours instead of 6. The extra hour here is worth 1.5 × $18 = $27.

For the spring version, subtract instead: a 7-hour night loses one hour from the total. If a week was going to land at exactly 40 and now lands at 39, the overtime that week disappears. The real hours worked set the total for overtime purposes, so check whether the pay stub counted 7 or 8 for that night, and whether the lost hour was treated as unpaid time or as a paid hour the employer chose to cover.

Things that can change the answer

• Salaried, exempt employees are generally paid a fixed salary and a clock change doesn't alter it. Hourly (non-exempt) workers are the ones this arithmetic applies to.
• Daily overtime states. A few states count overtime by the day as well as the week, so a 9-hour or 13-hour night can create daily overtime on its own. 12-hour shifts in daily overtime states explains how that works.
• Night differential. If a differential applies to hours worked at night, the extra hour is a night hour. Whether your payroll applies it automatically depends on whether it pays by clock punches or by the schedule; how night differential is calculated shows the math.
• Schedule-based payroll. Some systems pay what the roster says rather than what the punches say. On the two clock-change nights those numbers differ by an hour.
• Flat-hours pay or on-call arrangements. Day-rate and similar pay plans have their own rules for how a longer or shorter night is handled.

What to check on your own timecard

1. Find the night. Look at which shift of your rotation is in progress at 2:00 a.m. on the change date. A pattern calendar like the shift pattern calculator shows which of your shifts lands there, so you know ahead of time which pay stub to look at.
2. Write down your punch times for that night, including any meal you actually took.
3. Do the subtraction by elapsed time: clock-out minus clock-in, plus 1 hour in the fall (minus 1 in the spring), minus the unpaid meal.
4. Compare with the hours on the stub and add the week up before comparing the total to 40.
5. If the numbers differ, ask payroll how that night was entered. A short, dated, factual question gets the fastest answer.

Rules differ by state, employer and agreement. This is general information about how federal hours-worked rules and clock arithmetic fit together, not advice about your specific paycheck. Your employer's written pay policy, your state labor department and an employment attorney licensed in your state are the authorities on your situation. Federal references: 29 CFR § 778.105 (the workweek) and the Fair Labor Standards Act's overtime provision, 29 U.S.C. § 207(a).