StringToolsStringTools

Date Difference Calculator

Calculate days, weeks, months, and years between two dates — or add/subtract days from any date. Perfect for project deadlines, event planning, and contract dates.

Start Date
End Date

Result

Pick both dates to see the difference.

Two Modes, One Tool

Days Between Dates — Pick any two dates and instantly see how many days, weeks, months, or years separate them. Useful for project deadlines, contract durations, and personal milestones.

Add / Subtract Days — Start with a date, add or subtract any number of days, and see the resulting date. Used for due-date planning, return-by dates, and policy expiration calculations.

Common Use Cases

  • Project deadlines — "If I start today and need 60 working days, when's the deadline?"
  • Visa & passport validity — calculate exact days until expiry
  • Contract durations — verify how many days a lease, employment, or service contract covers
  • Event countdowns — days until your wedding, vacation, or product launch
  • Insurance claims — verify policy duration
  • Pregnancy tracking — calculate weeks pregnant from conception date