Days Between Dates Calculator
Calculate days, weeks, and calendar difference between two dates with optional inclusive counting.
How to calculate days between dates
Choose two dates in either order. The calculator shows the absolute difference in days, complete weeks, and a calendar difference in years, months, and days.
Inclusive counting
Without inclusion, January 1 to January 2 is one elapsed day. Including both dates makes the count two. The calendar difference still describes elapsed calendar time.
Days versus calendar months
Months and years are not calculated by dividing by 30 or 365. The calculation advances through the real calendar, respecting different month lengths and leap years.
Dates and time zones
Dates are normalized to UTC midnight so daylight-saving changes cannot add or remove a day.
Frequently asked questions
Can I enter dates in reverse order?
Yes. The calculator shows the absolute difference and notes when the second date is earlier.
Does it count business days?
No. This tool calculates calendar days and does not include weekend or holiday rules.
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