How to Find Duplicate Timesheet Entries and Overlaps

What counts as a duplicate timecard entry?

An exact duplicate is the same employee with the same date, start and end entered more than once. Define it by the fields you care about: if two rows have the same times but different jobs, you decide whether that is a duplicate.

Duplicate punches vs overlapping shifts

A duplicate punch is one clock event recorded twice. An overlap is two entries that cover some of the same time. Both can double-count hours, but the fix differs: a duplicate punch is removed; an overlap needs the right times chosen.

Common causes of duplicate time entries

Imports run twice.
A manager adds a missing punch and the employee also corrects it.
Double taps on an app or clock.
Sync retries.
Copy and paste of a whole week.

How do you check a CSV or spreadsheet for duplicates?

In Excel use Remove Duplicates for exact matches and the COUNTIFS formula in the FAQ for overlaps. Or paste the rows into the checker above, which does both and tells you why each row was flagged.

Worked examples

Entries 08:00-12:00 and 11:00-15:00 overlap by 60 minutes; entries 08:00-12:00 and 12:00-16:00 do not overlap; 08:00-12:00 and 13:00-17:00 are a split shift. With the sample data: 1 exact duplicate, 1 possible, 1 inside another, 2 overlap.

How to correct entries safely

Correct in the source system, keep the original, record who and why, and re-run the check. Do not delete a row only because the checker flagged it.

Pre-Payroll checklist

Run the checker on the full pay period.
Review exact duplicates, then overlaps, then possible duplicates.
Fix missing and repeated punches.
Re-export and re-check.
Keep the corrected file with your payroll records.

How do duplicates and overlaps affect pay and overtime?

If both rows are paid, the overlapping hours are paid twice. A duplicate can also push an employee over the weekly overtime line, so a single extra 8-hour row in a 40-hour week becomes 8 hours of overtime pay for time that was never worked. The checker adds up the hours that would be counted twice, so you can see the size of the problem before payroll runs.

When is an overlap legitimate?

Sometimes two entries share clock time for a real reason: a paid on-call period recorded alongside a task, two pay codes entered for the same hours, or a system that records a break as its own row. These are the cases where you decide, not the checker. A genuine split shift has a gap between its parts, and back-to-back entries that only touch are not overlaps.

Duplicate timecard entry checkerPaste your rows, pick the layout and the fields that define a duplicate, and see each flagged row with its reason.

Common questions

How do I find duplicate entries in a timesheet?

Paste the rows into the checker above. It groups entries by employee and the fields you choose (date, start, end, an extra column such as job) and lists every group with more than one entry, with row numbers. It also lists overlapping times, which a plain duplicate finder misses.

What causes duplicate timecard entries?

A time-clock import run twice, a manager adding a missed punch while the employee also corrects it, a double tap on a clock or app, a sync that retried, a week copied and pasted twice, or moving data between two systems.

How do I check if two shifts overlap?

For the same employee, two entries overlap when each one starts before the other ends: start of A is before end of B, and start of B is before end of A. Entries that merely touch (one ends at 12:00, the next starts at 12:00) do not overlap. The tool applies this rule, including shifts that run past midnight.

How do I find duplicate rows in Excel?

Select the data and use Data, Remove Duplicates, or Home, Conditional Formatting, Highlight Cells Rules, Duplicate Values. Those find identical rows only. To find overlapping times in Excel, with employee in column A, start date-time in B and end date-time in C, put this in D2 and fill down: =COUNTIFS($A:$A,A2,$B:$B,"<"&C2,$C:$C,">"&B2)>1. TRUE means the row overlaps another row (the row always counts itself once).

Can two shifts overlap on a timesheet?

For one employee, two entries covering the same clock time cannot both be hours worked in one place, so the overlap usually means the same time was entered twice or an old row was not removed. Check before paying: a genuine split shift has a gap between the parts, and entries for different pay codes may need a different layout. If both rows are paid, the overlapping hours are counted twice.

How do I detect duplicate clock-in or clock-out punches?

Switch to the punch layout. For each employee the punches are sorted by time and expected to alternate IN, OUT, IN, OUT. A second punch of the same kind within a few minutes is a repeated punch; an IN followed by another IN is a missing OUT; an OUT with no IN is a missing IN; and a very long shift usually means a missing punch.

How do I clean timekeeping data before payroll?

Remove or correct exact duplicates, resolve overlaps, fix missing punches, re-export, then run the checker again until it comes back clean. Keep the original records and note who changed what and why.

Sources

Reviewed on 25 Oct 2026 against the published sources below. Laws and prices change, so check the current position before you rely on a figure.

Try the calculator

Keep reading

This guide is general information, not legal, financial or religious advice. Figures are estimates worked out from the sources above and may differ from what applies to you. See the disclaimer. Found a mistake? Tell us.