Find days between dates, add or subtract days/weeks/months/years, and count working business days excluding weekends.
How to Use This Tool
- Choose Date Difference or Add/Subtract Days mode.
- Select the starting date and ending date or interval amount.
- Toggle "Exclude Weekends" to measure business workdays.
Formulas & Calculation Methodology
Duration = (End Date in ms - Start Date in ms) / (1000 × 60 × 60 × 24)
Worked Examples
Days Between Jan 1, 2026 and Dec 31, 2026
Scenario: Total calendar days in year 2026.
Step-by-step: Calendar calculation accounting for normal non-leap year.
Output: 364 Days difference
Supported Formats, Boundaries & Privacy
Inputs & Boundaries: Operates on standard calendar dates.
Local Client-Side Processing: Tool computations and file operations execute 100% locally within your browser sandbox via JavaScript and HTML5 Web APIs. Your input values, uploaded files, and computed results are never transmitted to our web servers. General site access, analytics, and advertising cookies are managed transparently under our Privacy Policy and Cookie Policy.
Frequently Asked Questions
What counts as a business day in this calculator?
Business days include Monday through Friday, skipping Saturdays and Sundays.
Can this tool calculate time elapsed across different years?
Yes, you can calculate differences across centuries with accurate Gregorian calendar calculations.