Date calculator
Pick a start date, the direction and how many days, weeks, months or years to add or subtract. The result comes with the day of the week.
How do I use this page?
- Fill in the fields in the form above — the result recomputes at once, with no page reload.
- Under the result you will find the interpretation scale, if the calculator has one: it says which range your value fell into.
- The formula we use is shown lower on this page — you can check the arithmetic yourself.
- To compute the same for another game or variant, change it in the select field — prices and pools update automatically.
Further reading
Theory — how does the calculator count days, months and years between dates?
Adding days to a date is unambiguous — for example, March 10th plus 30 days gives April 9th. Adding months and years is not, because months have between 28 and 31 days, so the calculator uses calendar semantics with clamping, adding years first and then months. If the resulting day does not exist in that month, the calculator uses the last available day — one month after January 31st is February 28th, or the 29th in a leap year. The result is shown together with the day of the week.
Frequently asked questions
What date is one month after 31 January?
Does the calculator handle leap years?
In what order are the units added?
See also
Age calculator
Calculate your exact age from your date of birth: full years, months and days. Also check how many days have p
Business days calculator
Count business days with automatic Polish public holidays or your own exclusions. Choose dates and review excl
Days Between Dates Calculator
Count the days, weeks, months and years between two dates. Exclusive and inclusive variants, correct leap-year