Date Calculator
Add or subtract days, weeks, months, or years from any date.
Runs in your browser — nothing is sent or saved.
How to add or subtract days from a date
- Pick a start date.
- Choose plus or minus.
- Type an amount and choose days, weeks, months, or years.
- Read the new date and the day of the week it lands on.
What the tool does
Start from any date and move forward or back by a set amount. You can add days to date, subtract days from date, or shift by whole weeks, months, or years, so a date plus days is one step. The result shows the full date, the weekday, and the plain ISO date, so it drops neatly into a form.
How months and years roll over
Adding weeks or days is simple counting. Adding months and years follows the calendar: the tool keeps the same day of the month where it can, and rolls over when the target month is shorter. Add one month to 31 January and you land in early March, because February has no 31st.
Where it helps
Work out a due date a set number of days from today, a future date for a booking, a warranty end, a notice period, or a deadline. Because it takes months and years too, it suits longer plans as well as short counts.
FAQ
How do I add days to a date?
Pick the start date, leave the operation on plus, type the number of days, and read the result. To subtract days from a date, switch to minus.
Can I add months or years?
Yes. Choose months or years as the unit. The tool keeps the day of the month where the target month allows and rolls over when it does not.
How do I find a date a number of days from today?
Leave the start date on today, then add the days. The tool gives the future date and its weekday.
Does it show the day of the week?
Yes. The result includes the weekday for the new date, along with the plain ISO date.
Are my dates private?
Yes. Everything runs in your browser and nothing is saved.