Add or Subtract Dates FAQ
How do I add days to a date or subtract days from a date?
Enter a start date, choose whether to work in mixed units or a single unit, then enter the amount to add or subtract. The calculator returns the exact resulting calendar date.
Can I add days, weeks, months, or years to any date?
Yes. You can add days to a date, subtract days from a date, or work with weeks, months, and years from any start date. The result updates instantly as you change the inputs.
Can I calculate what date is 30, 60, or 90 days from today?
Yes. Enter today or any other start date, then add the number of days you need. You can use this calculator to find future or past dates for deadlines, due dates, renewals, and schedule planning.
Can I use mixed units such as years, months, and days together?
Yes. You can combine date units like years, months, and days in one calculation, or switch to a single total in days, weeks, months, or years.
Why can adding months give different day counts?
Calendar months do not all have the same length. Adding 1 month means moving to the same calendar day in the next month when possible, not simply adding a fixed number of days.
Can I subtract dates with this calculator?
Yes. Enter negative values such as -7 days or -1 month to move backward from the start date and find an earlier calendar date.
Can I use this for deadlines, due dates, and planning dates?
Yes. This date calculator is useful for estimating deadlines, delivery dates, billing cycles, contract periods, renewals, and other schedule-based date calculations.
