Earth time is easy. But what about right now on the red planet? Live Mars sol clock.
A Martian day, called a sol, is 24 hours and 39 minutes and 35 seconds. That is 2.7% longer than an Earth day. Over a year, the difference adds up: a Martian year is 668.6 sols, which is 687 Earth days.
If you lived on Mars, your clock would drift out of sync with Earth by about 40 minutes every day. After two months, Mars time and Earth time would be completely reversed. Your morning would be our night. Your night would be our morning.
The first person to wake up on Mars will have to reset their internal clock every single day. Humans are not built for a 24.6-hour day. Studies on Mars analog missions show that people's sleep schedules drift badly. You would go to bed later and later every night until your body gave up and just slept whenever it wanted.
Mars also has no time zones. The entire planet runs on one standard time, called Coordinated Mars Time (MTC). It is based on the mean solar time at the Mars prime meridian, which passes through a crater called Airy-0 in the Sinus Meridiani region. There is no daylight saving time on Mars. There is nobody there to forget to change their clocks.
A sol is 24 hours, 39 minutes, and 35.244 seconds. That is 2.7% longer than an Earth day. If you set your alarm for 7:00 AM Mars time, it would go off 40 minutes later each Earth day.
The count starts at Sol 0 for each mission. NASA's Perseverance rover has been on Mars since February 2021. By Earth year 2026, that is over 1,800 sols. Each sol, the rover wakes up and drives a few meters.
Mars spins at almost the same rate as Earth, just slightly slower. It formed from the same spinning disk of gas and dust as Earth. The reason it is 2.7% slower is not fully understood, but it may be because Mars lost much of its early atmosphere and was struck by a large object billions of years ago.
Probably not well. Human circadian rhythm is tuned to 24 hours. Studies on Hawaii Space Exploration Analog and Simulation (HI-SEAS) show that crew members on a 24.6-hour schedule develop chronic sleep disruption, mood changes, and cognitive decline. Living on Mars would require drugs or extreme discipline to stay on schedule.