date(1) [plan9 man page]

DATE(1) 						      General Commands Manual							   DATE(1)

NAME

       date - print the date

SYNOPSIS

       date [ option ] [ seconds ]

DESCRIPTION

       Print the date, in the format

	    Tue Aug 16 17:03:52 CDT 1977

       The options are

       -u     Report Greenwich Mean Time (GMT) rather than local time.

       -n     Report the date as the number of seconds since the epoch, 00:00:00 GMT, January 1, 1970.

       The conversion from Greenwich Mean Time to local time depends on the $timezone environment variable; see ctime(2).

       If the optional argument seconds is present, it is used as the time to convert rather than the real time.

FILES

       /env/timezone
	      Current timezone name and adjustments.

       /adm/timezone
	      A directory containing timezone tables.

       /adm/timezone/local
	      Default timezone file, copied by init(8) into /env/timezone.

SOURCE

       /sys/src/cmd/date.c

																	   DATE(1)

gettimeofday(2) 						System Calls Manual						   gettimeofday(2)

Name
       gettimeofday, settimeofday - get or set date and time

Syntax
       #include <sys/time.h>

       gettimeofday(tp, tzp)
       struct timeval *tp;
       struct timezone *tzp;

       settimeofday(tp, tzp)
       struct timeval *tp;
       struct timezone *tzp;

Description
       The  system  call returns the system's notion of the current Greenwich time and the current time zone.  Time returned is expressed relative
       in seconds and microseconds since midnight January 1, 1970.

       The structures pointed to by tp and tzp are defined in <sys/time.h> as:

       struct timeval {
	    long tv_sec;	/* seconds since Jan. 1, 1970 */
	    long tv_usec;  /* and microseconds */
       };

       struct timezone {
	    int  tz_minuteswest;     /* of Greenwich */
	    int  tz_dsttime;	/* type of dst correction to apply */
       };

       The timezone structure indicates the local time zone (measured in minutes of time westward from Greenwich), and a flag  that,  if  nonzero,
       indicates that Daylight Saving time applies locally during the appropriate part of the year.

       Only the superuser can set the time of day.

Return Values
       A  0  return  value  indicates  that  the call succeeded.  A -1 return value indicates an error occurred, and in this case an error code is
       stored into the global variable errno.

Diagnostics
       The call fails under the following conditions:

       [EFAULT]       An argument address referenced invalid memory.

       [EPERM]	      A user other than the superuser attempted to set the time.

See Also
       date(1), stime(2), ctime(3)

																   gettimeofday(2)