Date Authority Tools
Professional utilities for business day calculations, project scheduling, and precise date math.
Work Day Calculator
Calculate business days with custom weekends.
➕Add Days
Find a future date by adding calendar or work days.
📅Days Between
Total count of days or weeks between two dates.
🔢Week Number
Identify the ISO week number for any date.
❄️Leap Year
Verify if a year is a leap year (includes history).