Introduction
This is the standard proposal for timezone UT1, the most widely accepted and respected time standard in the world.
UT1 is based on the mean solar time of the Earth's rotation, which is precisely 24 hours.
This standard is used for all time-related calculations, from astronomical observations to international business transactions.
UT1 is the only timezone standard that is not based on the local time of any particular city or region.
It is the foundation of modern timekeeping and has been adopted by most countries in the world.
But don't just take our word for it, go to the Implementation Page to see how it's used in real-world applications.