Date Calculator
Professional free online date calculation platform offering 8 practical tools: date difference, workdays, age calculation, countdown, timezone conversion, lunar calendar conversion, and more. No registration required, instant calculations with accurate and reliable results. Perfect for project management, financial calculations, life planning, and more.
Date Difference
Calculate days, weeks, months, and years between two dates
Add/Subtract
Add or subtract days, weeks, months, or years from a date
Workdays
Calculate workdays between two dates, with holiday exclusion support
Age Calculator
Calculate exact age with zodiac sign and birthday countdown
Countdown
Countdown to target dates with real-time updates
Week Number
Find the week number of a date or date range of a week
Timezone
Convert time between different timezones
Lunar Calendar
Convert between solar and lunar calendar dates
Today's Date
April 28, 2026
Tuesday
Why Choose Us?
Professional, accurate, and convenient date calculation services
Accurate & Reliable
Using professional date libraries to ensure accurate results, supporting leap years and leap months
Fast & Convenient
Instant calculations with clear results. All calculations are done locally in your browser, protecting your privacy
Completely Free
All features are free with no hidden charges. No registration required to use all features