, January 1, January 1, 1970

, January 1, January 1, 1970

In December August 1969ProgramEmployee Ken Thompson took the opportunity of leaving his wife and children for a month and began to create a completely new and revolutionary operating system, he developed a unix version on an old PDP-7 machine using the B compilation language. Afterwards, Thomas and his colleague Dennis Ritchie improved language B, developed C language, and rewritten Unix. The new version was released in 1971.

At that time, the computer operating system was 32-bit. The time was represented by 32-Bit Signed numbers, which could represent 68 years and 32-bit unsigned numbers, which could represent 136 years. They think it is enough to use 1970 as the time point. Therefore, the time function of C is so fixed. Later Java also used it, and the microcomputer also used it. The workstation was originally a UNIX system, of course, also used it. (In the future, if a 64-bit server is used, it will be okay .)

January 1, 1970 is counted as the birthday of UNIX and C language.

Because mainstream computers and operating systems use it, other instruments and mobile phones also use it.

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