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How do I calculate days between two dates?

Enter a start date and end date. The calculator counts the exact number of calendar days, weeks, months, and years between them — including leap years.

How many days until my birthday?

Set today as the start date and your next birthday as the end date. The result shows the exact number of days remaining.

Does it count leap years?

Yes — the calculator accounts for leap years (Feb 29) when computing day counts, so a year-long difference is always accurate.