Date Math
Add or subtract days, weeks, months, or years from any date. Instantly see the resulting date, day of week, and more. Free, no sign-up.
How to Use
1
Pick a start date
Select or type the date you want to start from.
2
Choose operation
Select whether to add or subtract time.
3
Enter amount and unit
Type the number and choose days, weeks, months, or years.
Features
Add or Subtract
Add or subtract any amount of time from any date.
Multiple Units
Work with days, weeks, months, or years.
Instant Results
See the resulting date, day of week, and time span immediately.
Flexible Dates
Start from any date — past, present, or future.
Frequently Asked Questions
Calculator guides
Recommended Reading
Practical guides matched to this calculator, its inputs, and the result users need to trust.
4 guides