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Date & Time

Date Difference Calculator

Days, weeks, months and business days between two dates.

Enter your values

Enter the start date in YYYY-MM-DD.

Enter the end date in YYYY-MM-DD.

Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.

Results
Total days
358
Weeks and days
51 weeks, 1 days
Whole months
11
Years and months
0 years, 11 months
Working days
257
Hours
8,592

Quick answer

Subtract the earlier date from the later one; the difference in milliseconds divided by 86,400,000 gives whole days.

At a glance

What it doesDays, weeks, months and business days between two dates.
CategoryDate & Time
Inputs neededStart date, End date
Main outputTotal days
CostFree — no sign-up, no download

How to use the Date Difference Calculator

  1. 1Enter the start date.
  2. 2Enter the end date.
  3. 3Read the gap in days, weeks, months and working days.

Inputs explained

Start date(YYYY-MM-DD)
Enter the start date in YYYY-MM-DD.
End date(YYYY-MM-DD)
Enter the end date in YYYY-MM-DD.

Worked example

Using the values the calculator loads with:

Inputs

  • Start date2026-01-01 YYYY-MM-DD
  • End date2026-12-25 YYYY-MM-DD

Results

  • Total days358
  • Weeks and days51 weeks, 1 days
  • Whole months11
  • Years and months0 years, 11 months
  • Working days257
  • Hours8,592

Frequently asked questions

Are both dates included?

The day count is exclusive of the start date; working days are counted inclusively so a Monday-to-Friday week shows 5.

Why don't months divide evenly?

Months are 28–31 days long, so calendar months are counted by the calendar, not by dividing days by 30.

What do I need to enter into the Date Difference Calculator?

Just 2 values: start date, end date. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.

How does the Date Difference Calculator work out the answer?

Subtract the earlier date from the later one; the difference in milliseconds divided by 86,400,000 gives whole days. The working is shown step by step so you can verify the result by hand.

Is the Date Difference Calculator free, and do I need an account?

It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.

Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.