Date calculator
Find the date that is a number of days, weeks, months or years before or after another date.
🔒 Everything runs in your browser. Nothing you choose or type is uploaded. How to verify
How to use it
- Pick a start date or leave it blank for today.
- Choose add or subtract and enter the amounts.
- Read the resulting date and weekday.
Handy for
Finding due dates, deadlines, warranty ends and notice periods.
Good to know
Months and years are applied before weeks and days. Use days only if you need an exact number of 24-hour periods.
Privacy: where the work happens
Everything you enter or choose is processed by JavaScript in your browser and never sent anywhere. Only the page code, and any library this tool needs, is downloaded from cdnjs or jsDelivr.
Questions
What happens at the end of a month?
If the target month is shorter, the day moves to its last day. January 31 plus one month gives February 28 or 29.
Are leap years handled?
Yes. Calendar rules are applied, including February 29.