Days Between Dates Calculator
Count the days, weeks and calendar months between any two dates.
- Days between0
- Weeks0.0
- Whole calendar months0
Inputs used
- Start dateJul 24, 2026
- End dateJul 24, 2026
About this calculator
The number of days between two dates is a straight count of calendar days from the start date to the end date — leap days included automatically. Weeks are that count divided by seven, and whole calendar months count how many times the start date's day-of-month recurs before the end date.
A common off-by-one to watch: this counts the days *between* the dates, so Monday to Friday is 4 days. If you need to include both endpoints (days of an event, medication days), add 1 to the result.
Swap the dates to count backwards — the result is negative, which is handy for "days until" a future date typed in the start field.
Frequently asked questions
Does the count include both the start and end date?
No — it counts the days between the two dates, so Monday to Friday is 4 days. If you need to include both endpoints, such as the days of an event or a course of medication, add 1 to the result.
How do I count the days until a future date?
Put today in the start field and the future date in the end field. The result is the number of days remaining; if you enter them the other way round the count comes out negative.
Are weekends and holidays included?
Yes — this counts every calendar day between the dates, including weekends, holidays and leap days. It does not calculate business days only.
How many weeks are between two dates?
Divide the day count by seven. The calculator shows this automatically, so 30 days reads as about 4.3 weeks.
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Results are informational only — not financial, medical or legal advice.