Date Calculator
Calculate the number of days between two dates online, or add and subtract days from any date with exact calendar math.
Date difference
Pick two dates to calculate
Add / subtract days
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Frequently asked questions
- How are the days between two dates counted?
- Both dates are treated as calendar days at local noon, so DST switches never skew the result. The difference is the exact number of calendar days between them.
- Can I add or subtract days from a date?
- Yes — enter a start date and a number of days. Negative values subtract, and the result handles month and year boundaries correctly.
- What about business days?
- This calculator counts calendar days including weekends. You can subtract weekend counts yourself, or adjust the number of days accordingly.
How to use
Uses exact calendar days, unaffected by timezones and DST. Optionally include the end day in the difference (common for countdowns).