Does it matter which date I put first?

No. The calculator detects when the end date is before the start date, swaps them internally, and shows a small note. The day count is always the absolute difference.

How are weekdays and weekend days counted?

The tool walks the calendar one day at a time and tallies each day's weekday. The earlier date is counted; the later date is not (so the totals sum to the day count). Saturday and Sunday are treated as the weekend.

Why is the month figure described as "approximate"?

Because months have different lengths, the month figure is the count of full calendar months between the two dates — borrowing days when the end day-of-month is earlier than the start. It will not equal days ÷ 30.

Does it handle leap years?

Yes. Native JavaScript dates count leap days correctly, so 2020-01-01 to 2021-01-01 returns 366 days.

Is the calculator free?

Yes. Everything runs in your browser. No signup, no logs, no rate limits.

Days Between Dates

Calculate the exact number of days between any two dates.

Written by Golam Rabbani, Founder & Lead Engineer

This interactive tool requires JavaScript. Read the formula and worked example below; you can compute the result by hand.

How to use this days between dates

Pick a start date.
Pick an end date.
Press Calculate to see the total days between them.
Read the breakdown for weeks, approximate months, weekdays, and weekend days.
Use Copy to grab the headline, or Reset to start over.

About this days between dates

The days-between-dates calculator counts the whole calendar days between any two dates, then breaks the gap down into weeks-plus-days, approximate months, and a weekday-versus-weekend split. It is the right tool when you need an integer day count — for project planning, rental durations, contract terms, or trivia.

Behind the scenes the calculator constructs two local-date objects from the year/month/day you enter (using `new Date(y, m-1, d)` so the value is anchored to local midnight rather than UTC), then divides the absolute millisecond gap by 86,400,000. The weekday-vs-weekend split iterates one day at a time using local-calendar arithmetic, so DST transitions and month boundaries are handled correctly. We assume a Saturday-and-Sunday weekend; if your jurisdiction has a Friday-and-Saturday weekend, the split labels will be reversed in meaning.

For example, 2024-01-01 to 2024-12-31 returns 365 days (52 weeks + 1 day), about 12 months, with 261 weekdays and 104 weekend days. Reverse the dates and the calculator still returns 365, with a note that the inputs were reversed. The day count itself is always an absolute integer; ordering does not affect it.

FAQ

Does it matter which date I put first?: No. The calculator detects when the end date is before the start date, swaps them internally, and shows a small note. The day count is always the absolute difference.
How are weekdays and weekend days counted?: The tool walks the calendar one day at a time and tallies each day's weekday. The earlier date is counted; the later date is not (so the totals sum to the day count). Saturday and Sunday are treated as the weekend.
Why is the month figure described as "approximate"?: Because months have different lengths, the month figure is the count of full calendar months between the two dates — borrowing days when the end day-of-month is earlier than the start. It will not equal days ÷ 30.
Does it handle leap years?: Yes. Native JavaScript dates count leap days correctly, so 2020-01-01 to 2021-01-01 returns 366 days.
Is the calculator free?: Yes. Everything runs in your browser. No signup, no logs, no rate limits.