Everyday numbers, solved
Find the number of days between two dates or add and subtract calendar days from any starting date.
Time
Measure time between dates or move a date by a number of days.
Days between
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Date math uses calendar days. The between-date result excludes the start date unless you use the inclusive count.
How it works
Quick answer: The number of days between two dates is the end date minus the start date. From October 20, 2026 to November 19, 2026 is 30 days (4 weeks, 2 days), or 31 days if you count both days.
Days between = end date − start date
Inclusive count = days between + 1Add or subtract mode moves a date forward or back by a number of calendar days.
Start October 20, 2026, end November 19, 2026: 30 days, which is 4 weeks, 2 days. Counting both the start and end day: 31 days.
The result is the days between the two dates without double-counting the start date.
Yes, the calendar math accounts for leap years.
For durations such as "days until", no. For counts such as "days of travel" where both days matter, use the inclusive count.