Date Calculator - Days Between Dates, Add or Subtract Days from a Date

Free date calculator with two modes. Days between two dates: pick a start and end date to see the exact number of days, weeks, months, and years between them. Date arithmetic: pick a base date and add or subtract days, weeks, months, or years to find a resulting date. Great for deadlines, contracts, project planning, or figuring out anniversaries. Runs entirely in your browser. Date Calculator - Days Between Dates, Add or Subtract Days from a Date on 712 Tools runs entirely inside your browser using modern JavaScript APIs - no server ever sees your data. That means instant results, complete privacy, and no upload limits.

Whether you need to calculate days between two dates, or add/subtract days, weeks, months, or years from any date for a debugging session, a quick sanity check, or a production incident, this tool is free to use as many times as you need. There are no watermarks, no sign-up, and no ads inside the tool itself.