Date Interval Days Calculator

This extension calculates the number of calendar days and working days between two selected dates. The start date and the end date are both excluded from the calculation. Only the days strictly between the two dates are counted. Calendar days include all days of the week. Working days exclude Saturdays and Sundays. The extension is useful for: • calculating deadlines • estimating time intervals • work planning • reporting and analytics Features: • two date inputs (start date and end date) • calendar days calculation • working days calculation (Monday–Friday) • automatic language detection (English / Ukrainian) • simple and lightweight interface • works offline, no data collection