Days Between Dates

Days = |End Date - Start Date|

This calculator counts every calendar day between two dates you choose. It also calculates weeks, approximate months, and business days (weekdays only, excluding Saturdays and Sundays).

What the results mean:

• Calendar days – the total number of days including weekends and holidays
• Weeks – the number of complete 7-day weeks
• Months – an approximation based on the average month length of 30.44 days
• Business days – weekdays only (Monday through Friday), excluding weekends but not public holidays

When to use this calculator:

• Project planning: How many working days until a deadline?
• Contract durations: Calculate the exact length of a lease, warranty, or agreement.
• Event countdowns: How many days until a wedding, vacation, or graduation?
• Rental periods: Count days for daily-rate equipment or property rentals.
• Legal deadlines: Many legal filings require action within a specific number of calendar or business days.

Practical examples:

• January 1 to March 31 = 89 days, or 90 in a leap year, and about 64 business days.
• A 6-month project from April 1 to September 30 = 182 days. That is 26 weeks to the day, so exactly 130 business days whichever year you run it in.

Worth knowing that the count is the gap between the two dates, not the number of days you occupy. A hotel booking from the 10th to the 12th is 2 nights, which is what this reports, even though you set foot in the place on three separate days. Add 1 if you want the inclusive count.

Tips:

• The order of dates does not matter – the calculator always gives a positive result.
• Business days exclude weekends but cannot account for public holidays, which vary by country and region.
• For precise business-day calculations involving holidays, manually subtract the number of holidays that fall on weekdays.
• Leap years are handled automatically. February 29 is included in counts when it falls within the date range.