Many go wrong on 2024’s first day, unknowingly referring to it as 1/365. 2024 is a leap year; it has one additional day (in February) compared to a common year. Today therefore is 1/366.
Leap years occur every 4 years, the last leap year was in 2020. This also means that those born on 29 Feb will be able to celebrate their actual birthdays this year after waiting for 4 years.