How many days are between two dates? While simple subtraction works for calendar days, the real challenge is calculating workdays for business and project planning.

Calendar Days vs. Business Days

For professional use, you need to exclude non-working days. A true business day calculation must:

• Exclude Weekends: Saturdays and Sundays are automatically removed from the count.
• Exclude Public Holidays: The calculation must skip specific national holidays to be accurate. Our Workdays Deadline Calculator is perfect for this.

Options for Precision

A good calculator lets you choose whether to "include the end date" in the total count, a common requirement for billing and contract work where the last day counts as a full day of service.

Further Reading

• Explore our main guide: The Ultimate Date Calculator Hub.
• Learn about time calculations in The Complete Time Calculator Resource.