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 19, 2026
- End dateJul 19, 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.
Results are informational only — not financial, medical or legal advice.