Date Calculator
Add or subtract days, weeks, months or years from a date.
Runs entirely in your browser. Nothing you type is uploaded.
About this tool
Enter a starting date, choose add or subtract, and set an amount in days, weeks, months or years. You get the resulting date and its weekday. Month arithmetic clamps to the end of the month, so 31 January plus one month is 28 or 29 February.
Questions & answers
- What is 90 days from today?
- Leave the start date at today, choose add, enter 90 days, and the result shows the date and the weekday it falls on.
- How are months added?
- The month number increases and the day is kept, unless that day does not exist in the target month, in which case it clamps to the last day of that month.
- Does this tool send my data to a server?
- Runs entirely in your browser. Nothing you type is uploaded.
Related tools
Need the full version? DateLab goes much deeper on this topic.