Work out the days between two dates, or add and subtract days, weeks, months and years from a date. Shows the duration, total days and the weekday.
How to use the Date Calculator
Choose whether to find the difference between two dates or to add or subtract a period.
Enter the dates, or the amount and unit.
Read the duration, total days and the resulting date with its weekday.
Frequently asked questions
By default the calculator counts the nights between the dates, so the start day is not double-counted. Turn on 'count the end day too' to include both the first and the last day.
Adding months or years keeps the day of the month where possible. If the target month is shorter, the date rolls into the next month, following standard calendar behaviour.
Yes. All calculations use real calendar dates, so leap years and varying month lengths are handled correctly.
It expresses the gap as full years, months and days, alongside the plain total in days and weeks.
The date calculator does two jobs: it measures the time between two dates, and it adds or subtracts a period from a date. It shows the result as a year, month and day breakdown, a total number of days and weeks, and the weekday of the resulting date.
It is handy for deadlines, due dates, ages, notice periods and planning. Everything is calculated in your browser.
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