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On 05:20:00 UTC on Saturday, 24 January 2065, the Unix time value will equal 4000000000 seconds.
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getuid(2) [bsd man page]

GETUID(2)							System Calls Manual							 GETUID(2)

getuid, geteuid - get user identity SYNOPSIS
#include <sys/types.h> uid = getuid() uid_t uid; euid = geteuid() uid_t euid; DESCRIPTION
Getuid returns the real user ID of the current process, geteuid the effective user ID. The real user ID identifies the person who is logged in. The effective user ID gives the process additional permissions during execution of "set-user-ID" mode processes, which use getuid to determine the real-user-id of the process that invoked them. SEE ALSO
getgid(2), setreuid(2) 4th Berkeley Distribution January 7, 1986 GETUID(2)

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GETUID(2)						     Linux Programmer's Manual							 GETUID(2)

getuid, geteuid - get user identity SYNOPSIS
#include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void); DESCRIPTION
getuid() returns the real user ID of the calling process. geteuid() returns the effective user ID of the calling process. When a normal program is executed, the effective and real user ID of the process are set to the ID of the user executing the file. When a set ID program is executed the real user ID is set to the calling user and the effective user ID corresponds to the set ID bit on the file being executed. ERRORS
These functions are always successful. CONFORMING TO
POSIX.1-2001, 4.3BSD. NOTES
History In Unix V6 the getuid() call returned (euid << 8) + uid. Unix V7 introduced separate calls getuid() and geteuid(). SEE ALSO
getresuid(2), setreuid(2), setuid(2), credentials(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 1993-07-23 GETUID(2)

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