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UTC, Tai, and Unix Time (2001)
AI times are identified by year, month, day, hour, minute, and second. There are exactly 86400 TAI seconds in every TAI day.
Unfortunately, xntpd, a program that synchronizes clocks using the Network Time Protocol, pandered to those broken localtime() libraries, at the expense of reliability. POSIX is a ``standard'' designed by a vendor consortium several years ago to eliminate progress and protect the installed base. Fortunately, the POSIX rules are so outrageously dumb---for example, they require that 2100 be a leap year, contradicting the Gregorian calendar---that no self-respecting engineer would obey them.
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