Date Calculator
Add or subtract days, weeks, months or years from a date.
Adding or subtracting days, weeks, months, or years from a specific date comes up constantly for deadlines, planning, and scheduling — this handles the calendar math automatically.
Why month and year math isn't as simple as day math
Adding "1 month" to January 31st doesn't cleanly land on a real date in February, since February has fewer days — this calculator handles those edge cases using standard calendar logic rather than a naive day-count approximation.
Frequently asked questions
Can I subtract time from a date, not just add?
Yes — select "subtract" to calculate backward from your starting date, useful for finding when something needed to start given a deadline.
Does this handle leap years correctly?
Yes — calculations use standard calendar rules, so leap years are automatically factored in when relevant.