Date Calculator

Add or subtract time from dates, compare two dates, and see exact date differences in days, weeks, months, and years.

Result date
Weekday
Difference
Calendar phrase

Use the date calculator to plan future dates, reverse time spans, or preview how many days and weeks separate two dates.

Date comparison

Total days
Total weeks
Months approx.
Years approx.

How to use

  • Select a start date then add or subtract days, weeks, months, or years.
  • Use the comparison tools to measure the gap between any two dates.
  • Use "Use Today" to set today's date instantly for quick planning.