Time Tools
Date Calculator
Easily add or subtract days, weeks, months, or years from any date with this free online date calculator. Plan events, deadlines, and more.
Inputs
Answer
New dateEnter a date and offset, then hit Calculate
Result date—
Start date—
Operation—
Offset—
How the date calculator works
Pick a start date, choose Add or Subtract, then enter any combination of years, months, weeks, and days. The calculator applies each offset in order — years and months first (with calendar rollover), then weeks and days.
Years± full years
Months± calendar months
Weeks± 7 days each
Days± calendar days
Month-end dates roll correctly — e.g. Jan 31 plus 1 month becomes Feb 28 (or Feb 29 in a leap year). Leave fields blank or enter 0 to skip that unit.
Worked example: Mar 15, 2025 plus 2 months and 1 week gives Tuesday, May 22, 2025.