Duplicate Date Finder

Spot repeated dates in schedules.

Find duplicate dates in a list instantly. Free duplicate date checker for schedules.

About Dup Dates

Spot repeated dates in schedules.

Counts identical date strings in a list.

Where it is used

Event schedules, bookings, data cleanup.

How to use the Dup Dates

Dates (one per line) — enter the value (e.g. 2026-01-01 2026-01-01 2026-01-02).
Calculate — press the Calculate button to see the result instantly above.

Formula

Count occurrences, flag >1.

Examples

Example

dates:2026-01-01 2026-01-01

Result: 2026-01-01 ×2

Frequently Asked Questions

Different formats?: Works on identical strings — normalize first.