Skip to content

Date Difference Calculator

Count the days between two dates, with weeks, approximate months, and years.

Your numbers

Days

90

Weeks
12 weeks, 6 days
Months (avg.)
2.96
Years
0.246

Results are estimates for planning. Check important figures with a qualified professional.

Quick answer

The Date Difference Calculator shows days, weeks, months, and years between two dates. How it works: Days = end date − start date; Months ≈ days ÷ 30.44. For example, with include the end date set to No, the days is 90.

How to use the Date Difference Calculator

  1. Turn on or off include the end date.
  2. Read days and the breakdown. Use Share to send the exact numbers, or Print to save a PDF.

How it's calculated

  • Days = end date − start date
  • Months ≈ days ÷ 30.44

Worked example

With include the end date of No:

Days: 90. Weeks: 12 weeks, 6 days.

Questions people ask

Should I include the end date?

For durations like a hotel stay, no. For counting days of an event that includes both dates, yes.