Discover dates for festivals, holidays, and events worldwide
Live countdown to the world's most celebrated festivals and holidays
Explore how today is represented across different cultures and traditions
Explore our latest guides on festivals, holidays, and cultural celebrations
Historical events, notable births, and memorable moments from April 21 throughout history
According to legend, Rome is founded.
Queen of the United Kingdom.
American musician.
Powerful date utilities to simplify your calendar calculations
Calculate the exact number of days, weeks, months, and years between any two dates.
Convert dates between Gregorian, Hijri, Hebrew, Persian, and other calendar systems.
Find the current moon phase and see upcoming full moons, new moons, and eclipses.
Generate and print customizable calendars for any month or year with holidays.
Calculate your exact age in years, months, days, hours, minutes, and seconds.
Convert times between different time zones and schedule international meetings easily.
โจ Coming Soon: More powerful date tools including Working Days Calculator, Holiday Finder, and Date Countdown Widget!
Want a specific tool? Let us know!