Should I include the end date when counting days?

It depends on your context. For travel hotel bookings, you pay for nights, so you exclude the checkout date. For contracts, court deadlines, or vacation duration, both the start date and the end date are often legally included.

How many business days are there in an average year?

A standard year has 365 days, which contains exactly 52 weeks plus 1 day. That equals 260 weekdays (or 261 in leap years). After accounting for roughly 10 federal/public holidays, an average worker has around 250 working days per year.

How does the Gregorian leap year rule work?

A year is a leap year if it is evenly divisible by 4, UNLESS it is divisible by 100. However, if a century year is also divisible by 400, it IS a leap year (e.g. 2000 was a leap year, but 1900 and 2100 are not).

Can this day counter calculate dates across different centuries?

Yes. The algorithm handles dates from 1900 through 2100+ seamlessly using standardized UTC millisecond timestamp calculation to avoid Daylight Saving Time (DST) 23-hour or 25-hour distortion.

What is Julian Day Number (JDN)?

Julian Day Number is a continuous count of days since the beginning of the Julian Period (January 1, 4713 BC). Astronomers use JDN to calculate exact orbital intervals without dealing with irregular month lengths or calendar reforms.

Everyday

↵ to calculate

Day Counter — Calculate Days, Weekdays & Time Between Dates

Free online Day Counter. Count exact days, business working days, weekends, weeks, and months between any two calendar dates. Includes option to include or exclude the end date.

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How to use this calculator

👉 Fill in the boxes below and your answer appears instantly — no maths needed, we do it all for you! 🎉

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In plain English — what does this do?

📏 Some countries say ‘30 degrees’ and others say ‘86 degrees’ for the same weather! Some say ‘5 km’, others say ‘3 miles’. This tool swaps between them instantly so you always know what it means.

📌 Direct Answer & Summary

A Day Counter calculates the exact duration between any two dates on the Gregorian calendar. It breaks down the duration into total days, business days (weekdays excluding weekends), weekend days, full weeks, and total elapsed hours. It is widely used by project managers, legal professionals, human resources, and students.

📅 Start Date

🏁 End Date

Include end date in calculation (add +1 day)

Total Duration

104 Days

14 weeks and 6 days

Business / Weekdays

74 days

Weekend Days

30 days

Total Hours

2,496 hrs

% of a Year

28.5%

What is Day Counter — Calculate Days, Weekdays & Time Between Dates?

How to use it

1️⃣ Select your Start Date from the calendar picker.
2️⃣ Select your End Date.
3️⃣ Choose whether to include the end date in the total count (commonly needed for event scheduling or contract terms).
4️⃣ View the total number of calendar days, business weekdays (Monday through Friday), and weekend days.
5️⃣ Review the breakdown into weeks + days, and total elapsed hours/minutes.

Formula & Variables

Total Days = End Date − Start Date (in milliseconds) ÷ (1000 × 60 × 60 × 24) Business Days = Total Days − [Weekend Count (Saturdays + Sundays)] Weeks & Days = Floor(Total Days ÷ 7) Weeks + (Total Days mod 7) Days

Variable Definitions:

Total Days Full 24-hour periods elapsed between two calendar dates

Business Days Working days from Monday through Friday only

Weekend Days Count of Saturdays and Sundays in the date range

💡 See it in action — a real example

Counting days from January 1, 2026 to April 15, 2026 (Tax Day): Total days = 104 calendar days (or 105 days including the end date). This equals 14 weeks and 6 days, containing 74 business working days and 30 weekend days.

📊 Standard Days per Month in Gregorian Calendar

Reference distribution of days across calendar months including leap year adjustments.

Month	Standard Year Days	Leap Year Days	Approximate Business Days
January	31 days	31 days	21 – 23 days
February	28 days	29 days (Leap)	20 – 21 days
March	31 days	31 days	21 – 23 days
April	30 days	30 days	21 – 22 days
May	31 days	31 days	21 – 23 days
June	30 days	30 days	20 – 22 days
July	31 days	31 days	21 – 23 days
August	31 days	31 days	21 – 23 days
September	30 days	30 days	20 – 22 days
October	31 days	31 days	21 – 23 days
November	30 days	30 days	20 – 22 days
December	31 days	31 days	21 – 22 days

* Leap years occur in years divisible by 4, except for century years not divisible by 400.

❓ Common questions

Should I include the end date when counting days?: It depends on your context. For travel hotel bookings, you pay for nights, so you exclude the checkout date. For contracts, court deadlines, or vacation duration, both the start date and the end date are often legally included.
How many business days are there in an average year?: A standard year has 365 days, which contains exactly 52 weeks plus 1 day. That equals 260 weekdays (or 261 in leap years). After accounting for roughly 10 federal/public holidays, an average worker has around 250 working days per year.
How does the Gregorian leap year rule work?: A year is a leap year if it is evenly divisible by 4, UNLESS it is divisible by 100. However, if a century year is also divisible by 400, it IS a leap year (e.g. 2000 was a leap year, but 1900 and 2100 are not).
Can this day counter calculate dates across different centuries?: Yes. The algorithm handles dates from 1900 through 2100+ seamlessly using standardized UTC millisecond timestamp calculation to avoid Daylight Saving Time (DST) 23-hour or 25-hour distortion.
What is Julian Day Number (JDN)?: Julian Day Number is a continuous count of days since the beginning of the Julian Period (January 1, 4713 BC). Astronomers use JDN to calculate exact orbital intervals without dealing with irregular month lengths or calendar reforms.