Date calculator
Calculate date difference and date addition/subtraction
Browser local processingInputs and files are not uploaded to our serverData processing
Instructions
Calculate date interval or project future dates
Use for calculating workdays, countdowns, billing periods, or anniversaries.
1Select start date
2Enter end date or number of days
3View intervals and target dates
After completionGet clear day difference or calculated date.Select Start Date First
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Elapsed days differ from inclusive day counts
Calculate the gap between dates or add and subtract days. Project durations and travel counts may include both endpoints, so agree on the counting convention first.
An example to check
Input and settings
2026-10-08 → 2026-10-10Expected result
2 daysThe elapsed gap is two days; inclusive counting covers three calendar dates. The tool does not automatically exclude weekends or public holidays.
Scope and limitations
- Browser date calculations can be affected by time zones and daylight saving. Verify cross-region timing or hour-level durations separately.
- Adding days is not adding business days and does not apply contractual or legal deadline rules.
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