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), about 64 business days.
• A 6-month project from April 1 to September 30 = 183 days, roughly 131 business days.

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.