Days between dates

How to count days between two dates

1. Start date. Pick the first day. It starts on today’s date.
2. End date. Pick the last day. It can be in the future or in the past.
3. End date counted or not. Leave it off to measure the gap between the two dates. Turn it on to count both the first and the last day, which adds one day.

The big number is how many days are between the dates. Under it you get the same span as weeks and days, months and days, years, months and days, working days, weekend days and hours.

Need the opposite? Tap Add days to a date, pick a date and type a number of days. You get the date you land on and its day of the week. A minus number counts back, so you can find the days from a date in either direction.

Need the formulas for a spreadsheet? Read the guide: how to calculate days between dates by hand, in Excel and in Google Sheets.

The formula

Every date is a position on the calendar. The number of days between two dates is the later position minus the earlier one.

Number of days = End date − Start date (+ 1 if you include the end date)

Worked example

How many days between dates 1 January 2024 and 1 March 2024?

• 1 January to 1 February is 31 days, because January has 31 days.
• 1 February to 1 March is 29 days, because 2024 is a leap year.
• 31 + 29 = 60 days.

Count the end date as well and the answer is 61 days. Here is the same 60 day span in other units.

Measured as	Result
Days	60
Weeks and days	8 weeks, 4 days
Months and days	2 months, 0 days
Working days (Monday to Friday)	44
Weekend days	16
Hours	1,440

1 January 2024 was a Monday. Sixty days is 8 full weeks, which holds 40 working days, plus Monday to Thursday of the ninth week. That gives 44.

Things worth knowing

• Which days are counted. By default the count starts on the start date and stops the day before the end date. Monday to Friday of the same week is 4 days. Include the end date and it is 5.
• Work days between dates. Working days are Monday to Friday. Public holidays are different in every country, so they are not removed. Subtract the ones that apply to you.
• Months are uneven. A month is counted from a day to the same day in the next month. If that day does not exist, such as 31 February, the last day of the month is used.
• Leap years. A year divisible by 4 has 29 days in February. Century years only count if they divide by 400, so 2000 was a leap year and 2100 is not.
• No time zones. The tool works with whole calendar days, so clock changes never add or drop a day.

Counting from a birthday? The age calculator gives an exact age in years, months and days, and the baby age calculator does the same in weeks and months. Counting down to an exam? Check what you need to score with the final grade calculator.

How this calculator was checked

Built by Rasel Hakkani, WordPress developer at Swift Web Dev. The counts were checked in three time zones, across a daylight saving change and across leap years. Working day counts were compared with a day by day count.

Last checked: October 2026. Found a wrong answer? Tell us and we will fix it.