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rtc(1M)			System Administration Commands		       rtc(1M)

NAME
       rtc - provide all real-time clock and GMT-lag management

SYNOPSIS
       /usr/sbin/rtc [-c] [-z zone-name]

DESCRIPTION
       On  x86	systems,  the rtc command reconciles the difference in the way
       that time is established between UNIX and MS-DOS systems. UNIX  systems
       utilize	Greenwich  Mean Time (GMT), while MS-DOS systems utilize local
       time.

       Without arguments, rtc displays	the  currently	configured  time  zone
       string.	The currently configured time zone string is based on what was
       last recorded by rtc-z zone-name.

       The rtc command is not normally run from a shell prompt; it  is	gener‐
       ally  invoked  by  the  system. Commands such as date(1) and rdate(1M),
       which are used to set the time on a system, invoke /usr/sbin/rtc -c  to
       ensure that daylight savings time (DST) is corrected for properly.

OPTIONS
       -c	       This  option  checks  for  DST and makes corrections if
		       necessary. It is normally run once a day by a cron job.

		       If there is no RTC time zone or	/etc/rtc_config	 file,
		       this option will do nothing.

       -z zone-name    This  option,  which  is	 normally run by the system at
		       software installation time, is used to specify the time
		       zone  in	 which the RTC is to be maintained. It updates
		       the configuration file /etc/rtc_config with the name of
		       the  specified  zone  and  the current GMT lag for that
		       zone. If there is an  existing  rtc_config  file,  this
		       command	will update it. If not, this command will cre‐
		       ate it.

FILES
       /etc/rtc_config	       The data file used to record the time zone  and
			       GMT  lag.  This	file  is completely managed by
			       /usr/sbin/rtc, and it is read by the kernel.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Architecture		     │x86			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │SUNWcsu			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       date(1), rdate(1M), attributes(5)

SunOS 5.10			  3 Oct 2003			       rtc(1M)

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