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About This Calculator
This calculator counts the exact number of days between two calendar dates, with options to include or exclude the start and end dates and to skip weekends or holidays. It handles date ranges spanning multiple years and leap year boundaries without error. Day counts are critical for computing interest accrual periods, project timelines, pregnancy due dates, and contractual deadline compliance.
Quick Tips
- 1 Business day counts exclude weekends and can optionally skip holidays.
- 2 There are 252 trading days in a typical stock market year.
- 3 Use day counts for contract deadlines — "30 days" and "1 month" can differ.
Example Calculation
Days between January 1, 2026 and December 31, 2026.
364 days apart | 52 weeks | 2026 is not a leap year (365 days total)
How Days Are Counted
The day counter computes the total calendar days between your start and end dates. It then breaks this down into complete weeks, remaining days, weekdays (Monday through Friday), and weekend days (Saturday and Sunday).
Weekday vs Weekend Breakdown
Knowing the number of weekdays is critical for business planning, project scheduling, and payroll. The weekend count helps with personal planning. The pie chart visualization shows the proportion at a glance.
Business Day Planning
For business purposes, weekdays represent potential working days. Subtract public holidays from the weekday count to get actual business days. In a typical year, there are about 252 business days after accounting for 10 federal holidays.
Using Day Counts for Project Management
Project managers use day counts to set realistic deadlines, allocate resources, and track progress. Knowing the exact number of working days helps in estimating effort and scheduling milestones accurately.
Frequently Asked Questions
The calculator counts the days from the start date up to but not including the end date. To include both dates, add 1 to the result or set your end date to one day later.
The calculator iterates through each day in the range and checks whether it falls on a weekday (Monday-Friday) or weekend (Saturday-Sunday). This gives an exact count rather than an estimate.
No. Public holidays vary by country, state, and employer. The weekday count includes all Monday-through-Friday days. Subtract your applicable holidays manually for a true business day count.
The calculator can handle any reasonable date range supported by the JavaScript Date object, which covers dates from the year 100,000 BCE to 100,000 CE. Practically, any range you need for planning purposes will work.