📅 Date & Time

Days Between Dates Calculator

Count the days, weeks and months between two dates.

Results

Days
358
Weeks and days
51 weeks, 1 days
Calendar difference
0 years, 11 months, 24 days
Business days (Mon–Fri)
256

📊 Days Between Dates Calculator chart

Proportional breakdown of the result.

What is the Days Between Dates Calculator?

Count the days, weeks and months between two dates. Dates are deceptively tricky — months have different lengths and leap years shift everything. These date and time calculators handle calendar math exactly, using UTC to avoid daylight-saving surprises.

Days Between Dates Calculator – free online date & time tool illustration
Days Between Dates Calculator — free, exact and private.

How to use the Days Between Dates Calculator

  1. Enter your start date, your end date.
  2. Tick the options you need: include end date.
  3. Results update automatically as you type; you can also press Calculate.
  4. Read the output: days, weeks and days, calendar difference, business days (mon–fri).
  5. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Days = (End − Start) ÷ 86,400,000 ms

Worked example

With start date = 2026-01-01, end date = 2026-12-25, include end date = no, the Days Between Dates Calculator returns days: 358; weeks and days: 51 weeks, 1 days; calendar difference: 0 years, 11 months, 24 days.

Tips for better results

  • Decide whether you need to include the end date when counting days.
  • Business-day counts exclude weekends but not public holidays unless you subtract them.
  • Timestamps are shown in UTC; convert to your local time zone as needed.

Frequently asked questions

What does the Days Between Dates Calculator do?

Count the days, weeks and months between two dates.

How is it calculated?

The Days Between Dates Calculator uses this method: Days = (End − Start) ÷ 86,400,000 ms.

Can you show an example?

With start date = 2026-01-01, end date = 2026-12-25, include end date = no, the Days Between Dates Calculator returns days: 358; weeks and days: 51 weeks, 1 days; calendar difference: 0 years, 11 months, 24 days.

Is the Days Between Dates Calculator accurate?

Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.

Is this tool free and private?

Yes — the Days Between Dates Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

Related tools

Add Days to Date CalculatorAdd or subtract days, weeks or months from a date.Business Days CalculatorCount working days (Monday–Friday) between two dates.Day of the Week CalculatorFind what day of the week any date falls on, past or future.Week Number CalculatorFind the ISO-8601 week number for any date.Countdown CalculatorCount the days, weeks and months until an upcoming date or event.Leap Year CheckerCheck whether a year is a leap year and find the next leap years.Time Duration CalculatorCalculate the duration between two clock times, including overnight shifts.Time Card CalculatorTotal weekly work hours from daily hours and calculate gross pay.

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