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Open toolDate Difference Calculator
Measure signed UTC calendar days between two dates, including leap days.
Maximum 200,000 characters. Input is not stored.
Ready. Use Ctrl/⌘ + Enter to run.
Completed and failed run counts are stored only on this device.
How to use this tool
Enter the start date and end date, then run. The start date is excluded: the same date gives zero days.
Supported input and limits
Strict YYYY-MM-DD dates. Uses UTC dates, not business days or local elapsed hours. Months/years are not approximated as fixed durations.
Frequently asked questions
Does daylight saving affect the result?
No. Calendar dates are evaluated at UTC midnight; local 23-hour or 25-hour days do not change the count.
Is my input uploaded?
No. Processing happens in a disposable worker on your device. Only local success/failure counts are saved; input is never stored.
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