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A time difference calculation answers one practical question: the elapsed time between two clock entries. For timesheets, that usually means the span from clock-in to clock-out, then any unpaid break deduction. The result can stay in hours and minutes for review or convert into decimal hours for payroll, billing, or spreadsheet totals.
The calculation also helps catch input mistakes before they spread. A 9:00 AM to 5:00 PM shift is 8 hours before breaks. A 9:00 PM to 5:00 AM shift is also 8 hours, but the end time falls on the next calendar day. The date matters whenever a shift crosses midnight.
U.S. timesheets commonly use month/day/year dates and 12-hour AM/PM times. That format makes AM/PM errors one of the fastest ways to double a shift or erase it. A 7:30 AM start and 4:00 PM end produce 8.5 elapsed hours. A mistaken 7:30 PM start changes the span completely.
Decimal hours use base 10, while clock minutes use base 60. One hour and 30 minutes equals 1.5 hours, not 1.30 hours. Convert minutes by dividing by 60. For example, 45 minutes equals 0.75 hours, and 15 minutes equals 0.25 hours. This conversion keeps payroll, billing, and spreadsheet formulas aligned.
Start with the end time minus the start time. If the shift crosses midnight, add 24 hours to the end time before subtracting. Then subtract unpaid break time. Paid time difference equals end time minus start time minus unpaid breaks, with the final answer converted to decimal hours if needed.
For example, a shift from 9:15 AM to 6:45 PM runs 9.5 elapsed hours. A 30-minute unpaid meal period equals 0.5 hours, so paid time is 9.0 hours. Federal law does not require adult meal or rest breaks, but short breaks provided by an employer, usually about 5 to 20 minutes, are compensable hours worked.
A one-off calculation is enough when you need to check a single shift, convert a time span, or verify one employee's daily total. Keep the inputs visible: start time, end time, break length, paid or unpaid break status, and final decimal hours. That record lets another reviewer follow the same math.
A managed workflow becomes necessary when multiple people submit time, managers approve corrections, or payroll needs locked records. Everhour Team Management supports approval workflows, locked periods, admin time correction, personal tracking limits, weekly capacity, roles, project assignments, team groups, and team-wide time policy defaults.
This content is for general information only, may not be fully up to date, and is provided without any warranty or liability.
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G2
Summer 2026
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Capterra
Summer 2026
Rated in the top time trackers across G2, Capterra, and TrustRadius — with consistent praise for ease of use, integrations, and support.
Subtract the start time from the end time. Convert minutes to decimal hours by dividing minutes by 60 if the result needs to feed payroll, billing, or spreadsheet formulas. A 10:20 AM to 3:50 PM span equals 5 hours and 30 minutes, or 5.5 decimal hours.
An overnight shift needs the end time treated as the next day. A 10:00 PM start and 6:00 AM end is 8 hours, not a negative number. Date fields prevent this mistake because they show that the end punch belongs to the following calendar day.
Unpaid lunch should be subtracted only when the break qualifies as unpaid under the applicable rule, policy, or contract. Under the federal baseline, a bona fide meal period is generally unpaid only when the employee is completely relieved from duty. An employee who performs duties while eating is still working.
Clock time uses 60 minutes per hour, while decimal hours use hundredths of an hour. Divide the minutes by 60 before adding them to the whole hours. Thirty minutes divided by 60 equals 0.5, so 1 hour and 30 minutes equals 1.5 hours.
Rounded clock punches can change the total, so the rounding method must stay neutral over time. Federal time-clock rounding is accepted to the nearest 5 minutes, tenth, or quarter-hour only if it averages out and does not underpay employees for actual hours worked.
Everhour Team Management gives admins lock rules, approval workflows, admin time correction, personal tracking limits, weekly capacity, roles, project assignments, team groups, and team-wide policy defaults. Those controls help teams move from individual time-span checks to reviewed, protected timesheet records.
Use a calculator for one shift. Use Everhour Team Management when submitted time needs approvals, correction controls, locked periods, and team policy defaults that support cleaner payroll review.
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