Date Calculator
Count days between dates, add days to a date, or count working days.
Step by step
Your previous calculations
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Questions & answers
Why is the answer empty?
Choose the day, the month and the year for every date. In Add / subtract, enter at least one number of years, months, weeks or days.
Should I tick “Count the end date too”?
Tick it when both days count, like the days of a holiday or a contract: 1 to 31 January is then 31 days. Leave it off to count the days in between, like a countdown: 1 to 31 January is 30 days.
Why is 31 January plus 1 month 29 February, not 2 or 3 March?
Adding a month keeps you in the next month. When that month is shorter, its last day is used (29 February in a leap year, otherwise 28 February). The page tells you when this happens.
My country's weekend is Friday and Saturday. How do I count working days?
In Working days, choose your weekend in the list: Saturday + Sunday, Friday + Saturday, only Friday, only Sunday, or no weekend. Both dates are counted.
Are public holidays taken out of working days?
No. Holidays are different in every country and region, so they are not taken out. Subtract your holidays from the answer yourself.
What is the ISO week number?
Weeks start on Monday, and week 1 is the week with the first Thursday of the year. So 31 December 2024 is in week 1 of 2025. This is the numbering used in Europe and in most diaries.