<HTML ><HEAD ><TITLE >Linux $B$O$I$N$h$&$K;~4V$r7W$C$F$$$k$N$+(B</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.54"><LINK REL="HOME" TITLE="The Clock Mini-HOWTO" HREF="index.html"><LINK REL="PREVIOUS" TITLE="$B$O$8$a$K(B" HREF="introduction.html"><LINK REL="NEXT" TITLE="$B%=%U%H%&%'%"(B" HREF="software.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" ><DIV CLASS="NAVHEADER" ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The Clock Mini-HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="introduction.html" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="software.html" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="TIME-TRACKING" >2. Linux $B$O$I$N$h$&$K;~4V$r7W$C$F$$$k$N$+(B</A ></H1 ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN80" >2.1. $B4pK\E*$J;EAH$_(B</A ></H2 ><P >Linux $B%7%9%F%`$K$O(B 2 $B<oN`$N;~7W$,$"$j$^$9!#$R$H$D$O!"%P%C%F%j!<6nF0$N(B $B%j%"%k%?%$%`%/%m%C%/(B(RTC $B$d(B CMOS $B%/%m%C%/$b$7$/$O(B $B%O!<%I%&%'%"%/%m%C%/$H$b8F$P$l$F$$$^$9(B)$B$G$"$j!"$3$l$O%7%9%F%`$NEE8;$,(B $B%*%U$N;~$K$bF0$$$F$$$^$9$,!"%7%9%F%`$N2TF/Cf$O;H$o$l$^$;$s!#(B $B$b$&$R$H$D$O!"%7%9%F%`%/%m%C%/(B (System Clock, $B%+!<%M%k%/%m%C%/$b$7$/$O(B $B%=%U%H%&%'%"%/%m%C%/$H$b8F$P$l$^$9(B) $B$G$"$j!"$3$l$O%?%$%^3d$j9~$_$K4p$E$/(B $B%=%U%H%&%'%"!&%+%&%s%?(B(software counter)$B$G$9!#(B $B%7%9%F%`%/%m%C%/$O(B $B%7%9%F%`$N2TF/Cf0J30$K$OB8:_$7$J$$$N$G!"5/F0;~$K(B RTC ($B$b$7$/$O(B $B$=$l0J30$N30It;~7W(B) $B$K$h$C$F=i4|2=$5$l$kI,MW$,$"$j$^$9!#(B<TT CLASS="LITERAL" >ntpd</TT > $B$NIUB0J8=q$G!V%/%m%C%/!W$r;2>H$9$k$H$$$&>l9g!"(BRTC $B$G$O$J$/%7%9%F%`(B $B%/%m%C%/$N;2>H$r0UL#$7$F$$$^$9!#(B</P ><P >$B$=$l$i(B 2 $B<oN`$N;~7W$N%:%l6q9g$O0[$J$C$F$$$k$N$G!"N><T$O=y!9$K?)$$0c$C$F$$$-!"(B $BAPJ}$H$b$@$s$@$s$H<B:]$N@53N$J;~4V$+$iN%$l$F$$$-$^$9!#$3$l$i$r@53N$K(B $BJ]$D>e$G:G$b4JC1$JJ}K!$O!";~4V$,%:%l$k3d9g$r7W;;$7$F%=%U%H%&%'%">e$G(B $B$=$l$r=$@5$9$k$3$H$G$9!#(BRTC $B$O%7%9%F%`$N2TF/$7$F$$$J$$;~$@$1;HMQ$5$l$k$b$N(B $B$J$N$G!"(BRTC $B$N=$@5$O!"5/F0;~$K;~9o$rFI$_9~$`:]$K(B <B CLASS="COMMAND" >clock(8)</B > $B$+(B <B CLASS="COMMAND" >hwclock(8)</B > $B$r;H$C$F9T$$$^$9!#%7%9%F%`%/%m%C%/$N(B $B=$@5$O!"%?%$%^3d$j9~$_$K$h$j%7%9%F%`;~4V$,?J$`:]$K(B <B CLASS="COMMAND" >adjtimex(8)</B > $B$r;H$C$F%:%l$r=$@5$9$k$3$H$K$h$j<B;\$7$^$9!#(B</P ><P ><B CLASS="COMMAND" >adjtimex(8)</B > $B$NBe$o$j$K(B <B CLASS="COMMAND" >cron</B > $B$r;H$C$F(B <B CLASS="COMMAND" >clock(8)</B > $B$+(B <B CLASS="COMMAND" >hwclock(8)</B > $B$r(B $BDj4|E*$K<B9T$7!"%7%9%F%`%/%m%C%/$r(B($B@53N$KD4@0$7$?(B)RTC $B$KF14|$5$;$k(B $B$H$$$&J}K!$b$J$$$o$1$G$O$"$j$^$;$s!#$3$l$O(B <B CLASS="COMMAND" >clock(8)</B > $B$N%^%K%e%"%k%Z!<%8$G?d>)$5$l$F$$$^$9$7!"$"$kDxEYIQHK$KF14|$5$;$k$3$H$G(B $BN><T$N;~4V$N%:%l$r>.$5$/$7$F%7%9%F%`%/%m%C%/$N;~9o$,BgI}$K!V%8%c%s%W!W$9$k(B $B$3$H$,$J$1$l$PLdBj$J$/5!G=$7$^$9$,!"(B<B CLASS="COMMAND" >adjtimex(8)</B > $B$r;H$C$FD4@0$7$?J}$,%(%l%,%s%H$G$9!#%"%W%j%1!<%7%g%s$N$J$+$K$O!"(B $B;~4VD4@0$G;~7W$rAL$i$;$?>l9g$K$O%(%i!<$K$J$k$b$N$,$"$k$+$b$7$l$^$;$s!#(B</P ><P >$B;~4VD4@0$NJ}K!$H$7$F$O!"B>$K$b(B <TT CLASS="LITERAL" >ntpd</TT > $B$H$$$&%W%m%0%i%`$r(B $B;H$C$F%M%C%H%o!<%/%?%$%`%5!<%P$dEEGH;~7W$+$iDj4|E*$K;~4V$rFI$_9~$s$G(B $B7QB3E*$K%7%9%F%`%/%m%C%/$N8m:9$rD4@0$9$k$3$H$G!"%7%9%F%`%/%m%C%/$N;~9o$NBgI}$J(B $B!V%8%c%s%W!W$rHr$1$kJ}K!$b$"$j$^$9!#$b$75/F0;~$KI,$:%M%C%H%o!<%/%3%M%/%7%g%s$r(B $BD%$k$3$H$,=PMh$k$J$i!"(BRTC $B$r40A4$KL5;k$7!"(B<B CLASS="COMMAND" >ntpdate</B > ($B$3$l$O(B <TT CLASS="LITERAL" >ntpd</TT > $B%Q%C%1!<%8$KIUB0$7$F$$$^$9(B) $B$r;H$C$F(B LAN $BFb$N%m!<%+%k%^%7%s$d%$%s%?!<%M%C%H>e$N%j%b!<%H%^%7%s$K$"$k%?%$%`(B $B%5!<%P$K$h$j%7%9%F%`%/%m%C%/$r=i4|2=$9$k$3$H$b$G$-$^$9!#$7$+$7!"$b$7(B $BI,$:$7$b%M%C%H%o!<%/%3%M%/%7%g%s$rD%$l$J$$$H$-$,$"$k>l9g$d!"5/F0Cf$K(B $B@53N$J;~4V$r<hF@$7$?8e$K%M%C%H%o!<%/$K7R$,$J$1$l$P$J$i$J$$>l9g$O!"(B RTC $B$N;~4V$bD4@0$7$F$*$/I,MW$,$"$j$^$9!#(B</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN99" >2.2. $B%3%s%U%j%/%H$N2DG=@-(B</A ></H2 ><P ><TT CLASS="FILENAME" >ntpd</TT > $B$N$h$&$J%W%m%0%i%`$r;H$C$F$$$k$J$i!"(BRTC $B$r(B ($BD4@0:Q$_$N(B)$B%7%9%F%`%/%m%C%/$KF14|$5$;$h$&$H;W$&$+$b$7$l$^$;$s!#(B $B$7$+$7!"$3$l$O%7%9%F%`$,?tJ,0J>e$KEO$C$F<WCG$5$l$k2DG=@-$,$"$k>l9g$K$O(B $BM=A[DL$j$K>e<j$/$O$$$-$^$;$s!#5/F0;~$K(B RTC $B$rD4@0$9$k%W%m%0%i%`(B $B$H43>D$7$F$7$^$&$+$i$G$9!#(B</P ><P >$B%7%9%F%`$,EZF|$J$7$G(B 24 $B;~4V2TF/$7!"EE8;$,<WCG$5$l$?>l9g$G$b$9$0$K:F5/F0$9$k(B $B$h$&$K$J$C$F$$$k$J$i!"%7%9%F%`%/%m%C%/;~4V$K4p$E$$$F:F5/F0D>A0$K(B RTC $B$r(B $B@_Dj$9$k$3$H$O2DG=$G$9!#$=$N:]$O(B RTC $B$K$O%j%V!<%HCf$N7P2a;~4V$NHO0OFb$G$7$+(B $B8m:9$,@8$8$J$$$N$G!"(BRTC $B$N%:%l6q9g$rCN$kI,MW$b$J$/$J$j$^$9!#(B</P ><P >$B$b$A$m$s%7%9%F%`$K$OM=A[30$N>c32$,IU$-$b$N$G$9!#$=$3$G!"%7%9%F%`%/%m%C%/$,(B $B2?$i$+$N%W%m%0%i%`$K$h$C$F@53N$KD4@0$5$l$F$$$k>l9g!"%+!<%M%k$N%P!<%8%g%s$K(B $B$h$C$F$O(B RTC $B$r(B 11 $BJ,$4$H$K%7%9%F%`%/%m%C%/$KF14|$5$;$k$b$N$,$"$j$^$9!#DL>o(B 11 $BJ,4V$N$&$A$K(B RTC $B$,%7%9%F%`%/%m%C%/$HBg$-$/?)$$0c$&$3$H$O$"$j$^$;$s$,!"(B $B%7%9%F%`$,D9;~4V%@%&%s$7$F(B RTC $B;~4V$,Bg$-$/%:%l$?>l9g$OLdBj$,@8$8$^$9!#(B $B$J$<$J$i(B RTC $B$N8m:9$rD4@0$9$k%W%m%0%i%`$O!"<+J,$,(B RTC $B$r:G8e$K%j%;%C%H$7$?(B $B;~9o$r(B<EM >$B@53N$K(B</EM >$B5-21$7$F$$$kI,MW$,$"$k$N$G$9$,!"%+!<%M%k$K$O(B $B$=$N$h$&$J>pJs$O5-O?$5$l$F$$$J$$$+$i$G$9!#(B</P ><P >UNIX $B$NEAE}$r=E$s$8$k?M$NCf$K$O!"(BLinux $B%7%9%F%`$O$b$H$b$H(B 24 $B;~4VO"B32TF/(B $B$5$;$k$b$N$J$N$@$H;W$C$F$$$kJ}$b$$$k$3$H$G$7$g$&!#$7$+$7!"%G%e%"%k%V!<%H(B $B$G;~!9$OJL$N(B OS $B$r<B9T$7$F$$$k%f!<%6$b$$$^$9$7!"%i%C%W%H%C%W$G(B Linux $B$r;H$C$F$$$k%f!<%6$OEE8;$rMn$H$9$3$H$G;HMQCf0J30$N;~4V$G$N%P%C%F%j!<$N(B $B>CLW$rKI$$$@$j$b$7$F$$$^$9!#$=$l0J30$K$b!"C1$K;H$C$F$$$J$$%^%7%s$r(B $BD9;~4V<B9T$5$;$CJ|$7$K$9$k$N$r9%$^$J$$?M$b$$$^$9(B ($B$`$m$s!"EE8;$rF~$l$?(B $B$^$^$K$9$kJ}$,NI$$$H$$$&5DO@$O=<J,>5CN$O$7$F$$$^$9$,(B)$B!#$=$N$h$&$J>l9g!"(B 11 $BJ,$4$H$KF14|$r9T$&5!G=$OHs>o$KITET9g$J5!G=$H$$$&$3$H$K$J$j$^$9!#(B</P ><P >$B$3$N(B($B>l9g$K$h$C$F$OITET9g$J(B)$B5!G=$O!"%+!<%M%k$N%P!<%8%g%s$,0[$J$k$H(B $B?6$kIq$$$b0[$J$k$h$&$G$9(B ($B$*$=$i$/(B <TT CLASS="FILENAME" >xntpd</TT > $B$d(B <TT CLASS="FILENAME" >ntpd</TT > $B$N%P!<%8%g%s$,0[$J$k>l9g$b!"(B $B?6$kIq$$$,JQ$o$k$h$&$G$9(B)$B!#$=$l$f$(!"$b$7(B <TT CLASS="FILENAME" >ntpd</TT > $B$H(B <B CLASS="COMMAND" >hwclock</B > $B$NN>J}$r(B $B<B9T$7$F$$$k$J$i!"M=$a%F%9%H$r9T$C$F!"$=$N5!G=$,<B:]$K$I$&$$$&?6$kIq$$$r(B $B$9$k$N$+3NG'$9$kI,MW$,$"$k$G$7$g$&!#$b$7%+!<%M%k$,(B RTC $B$r%j%;%C%H$9$k(B $B$N$r;_$a$5$;$k$3$H$,$G$-$J$$>l9g$O!"(BRTC $B$KBP$9$k;~4VD4@0$r0l@Z9T$o$J$$(B $B$h$&$K$9$kI,MW$,$"$k$G$7$g$&!#(B</P ><P >$B$3$&$7$?$3$H$r@)8f$7$F$$$k$N$O!"%+!<%M%kFb$N(B <TT CLASS="FILENAME" >/usr/src/linux-2.0.34/arch/i386/kernel/time.c</TT > $B$G$9(B ($B%Q%9Cf$N%P!<%8%g%sHV9f$O!"$*<j;}$A$N%+!<%M%k$N%P!<%8%g%sHV9f$KCV$-49$($F(B $B$/$@$5$$(B)$B!#JQ?t(B <TT CLASS="VARNAME" >time_status</TT > $B$,(B <TT CLASS="VARNAME" >TIME_OK</TT > $B$K@_Dj$5$l$k$H!"%+!<%M%k$O%7%9%F%`;~4V$r(B 11 $BJ,$4$H$K(B RTC $B$K=q$-9~$b$&$H(B $B$7!"$=$l0J30$NCM$@$H(B RTC $B$K$O43>D$7$^$;$s!#(B($BNc$($P!"(B<TT CLASS="FILENAME" >ntpd</TT > $B$d(B <TT CLASS="FILENAME" >timed</TT > $B$r;H$C$F(B) <B CLASS="COMMAND" >adjtimex(2)</B > $B$r(B $B8F$S=P$9$3$H$G!"$3$l$r%*%s$K$9$k$3$H$,$G$-$^$9!#(B<B CLASS="COMMAND" >settimeofday (2)</B > $B$r8F$Y$P!"(B<TT CLASS="VARNAME" >time_status</TT > $B$r(B <TT CLASS="VARNAME" >TIME_UNSYNC</TT > $B$K@_Dj$9$k$3$H$,$G$-$^$9!#$3$l$O!"%+!<%M%k$K(B RTC $B$ND4@0$r$7$J$$$h$&;X<($9$k$b$N$G$9!#$3$NJU$j$N$3$H$r>\$7$/@bL@$7$?(B $BJ8=q$rCx<T$OCN$j$^$;$s!#(B</P ><P >$B%+!<%M%k$N%P!<%8%g%s$K$h$C$F$O!"(BCPU $B$X$NEE8;6!5k$r<WCG$7$F%P%C%F%j!<(B $B$rD9;}$A$5$;$k(B sleep $B5!G=$KLdBj$,$"$k$b$N$,$"$k$H$$$&Js9p$r<u$1$F$$$^$9!#(B $B:GNI$N2r7h:v$O!"%+!<%M%k$r>o$K:G?7$N>uBV$K99?7$7$F$f$/$3$H$G$"$j!"(B $B%+!<%M%k$N4IM}<T$KLdBj$rJs9p$9$k$h$&$K$9$k$3$H$G$9!#(B</P ><P >RTC $B$N68$$J}$,L/$J>l9g$O!"%O!<%I%&%'%">e$NLdBj$+$b$7$l$^$;$s!#(BRTC $B%A%C%W$K$O%j%A%&%`EECS$,FbB"$5$l$F$$$^$9$,!"$3$NEECS$,@Z$l$?$N$+$b(B $B$7$l$^$;$s!#$^$?!"%^%6!<%\!<%I$K$h$C$F$O30It%P%C%F%j!<$r;H$($k$h$&$K(B $B@_7W$5$l$?$b$N$b$"$j$^$9(B($B%8%c%s%Q$N@_Dj$r3NG'$7$F$/$@$5$$(B)$B!#(B CMOS RAM $B$b(B RTC $B$HF1$8EECS$GF0$$$F$$$k$N$G$9$,!";~7W$NJ}$,(B $BEENO$N>CHq$,7c$7$$$N$G$?$$$F$$@h$KF0$+$J$/$J$j$^$9!#%7%9%F%`(B $B%/%m%C%/$NI=<($,$*$+$7$$>l9g$O!"3d$j9~$_$KLdBj$,$"$k$+$b$7$l$^$;$s!#(B</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="UTC-DST" >2.3. RTC $B$K$O%m!<%+%k%?%$%`$+(B UTC $B$N$I$A$i$r;H$&$Y$-$+!)(B DST $B$C$F2?!)(B</A ></H2 ><P >Linux $B$N%7%9%F%`%/%m%C%/$,<B:]$K%+%&%s%H$7$F$$$k$N$O!"(B1970$BG/(B1$B7n(B1$BF|(B $B$+$i$N7P2aIC?t$G$"$j!";~9o$OI,$:6(Dj@$3&;~(B (UTC, Coodinated Universal Time) $B$r;H$$$^$9(B (UTC $B$O(B GMT (Greenwich Mean Time) $B$H$[$\F15A$G$9!#(B $BN><T$O5;=QE*$K$OJLJ*$G$9$,Hs>o$K;wDL$C$F$$$k$N$G!"0lHL$N%f!<%6$O(B $BF1$80UL#$G;H$&$3$H$,B?$$$h$&$G$9(B)$B!#(BUTC $B$O!"2F;~4V(B (DST, Daylight Saving Time) $B$,I,MW$J>l9g$G$bJQ99$5$l$k$3$H$O$"$j$^$;$s!#JQ$o$k$N$O!"(BUTC $B$H%m!<%+%k%?%$%`(B $B$H$N4V$G$NJQ49J}K!$@$1$G$9!#%m!<%+%k%?%$%`$X$NJQ49$O!"%"%W%j%1!<%7%g%s(B $B%W%m%0%i%`$K%j%s%/$5$l$?%i%$%V%i%j4X?t$K$h$C$F<B9T$5$l$^$9!#(B ($BLuCm!'(BDST ($B$$$o$f$k%5%^!<%?%$%`(B)$B$K$D$$$F$O!"(B $B$$$^$N$H$3$mF|K\$G$O4X78$"$j$^$;$s!#(B)</P ><P >$B$3$l$O!"7k2LE*$KFs$D$N0UL#$r;}$A$^$9!#$^$:Bh0l$K!"%"%W%j%1!<%7%g%s$,(B $B%m!<%+%k%?%$%`CN$kI,MW$,$"$k>l9g$O!"(BDST $B$,M-8z$G$"$k$+H]$+$K4X$o$i$:!"(B $BF1;~$K%f!<%6$N%?%$%`%>!<%s$bCN$kI,MW$,$"$k$H$$$&$3$H$G$9(B ($B%?%$%`%>!<%s(B $B$K$D$$$F$O!"<!>O$r;29M$K$7$F$/$@$5$$(B)$B!#BhFs$K!"(BDST $B$,LdBj$K$J$k>l9g$G$b!"(B UTC $B<+BN$KJQ99$O$J$$$N$G!"%+!<%M%k$O%7%9%F%`%/%m%C%/$d(B RTC $B$rJQ99$9$kI,MW(B $B$,$J$$$H$$$&$3$H$G$9!#$=$l$f$((B Linux $B$7$+Av$i$;$J$$%^%7%s$N>l9g!"(B RTC $B$O%m!<%+%k%?%$%`$G$O$J$/(B UTC $B$K@_Dj$9$Y$-$G$9!#(B</P ><P >$B$7$+$7$J$,$i!"(BRTC $B$,%m!<%+%k%?%$%`$rI=<($7$F$$$k$3$H$rA0Ds$K$7$?(B OS $B$r(B $BF15o$5$;$F!"%G%e%"%k%V!<%H%7%9%F%`$K$7$F$$$k?M$OB?$$$H;W$$$^$9!#$=$N>l9g!"(B <B CLASS="COMMAND" >hwclock</B > $B$O(B RTC $B$,%m!<%+%k%?%$%`$+(B UTC $B$G$"$k$+(B $B$rCN$kI,MW$,$"$j!"$5$i$K$=$N;~9o$r(B 1970$BG/(B1$B7n(B1$BF|(B (UTC) $B$+$i$N7P2aIC?t$X$H(B $BJQ49$9$kI,MW$,$"$j$^$9!#$?$@!"$3$l$O(B RTC $B$KBP$9$k2F;~4VD4@0$^$G$O9T$o$J$$(B $B$3$H$+$i!"2F;~4V$X$NJQ99$O(B Linux $B0J30$N(B OS $BB&$G<B9T$9$kI,MW$,$"$j$^$9(B ($B$3$l$O(B RTC $B$N;~4V$rJQ99$9$k:]$OC10l%W%m%0%i%`$r;H$$!"=EJ#$7$?JQ99$r9T$o$J$$(B $B$H$$$&%k!<%k$NNc30$KEv$?$j$^$9(B)$B!#(B</P ><P >$B;DG0$J$,$i!"(BRTC $B$d(B CMOS RAM $B$K$O%m!<%+%k%?%$%`$NI=<($K4X$7$FI8=`;~4V$+(B DST $B$J$N$+$r6hJL$9$k$?$a$N%U%i%0$,$J$$$N$G!"(BOS $B$O!"$*$N$*$NB>$N(B OS $B$+$i$OJ,$+$i$J$$(B $B>l=j$K$=$N>pJs$rJ]B8$7$F$$$^$9!#$D$^$j!"2F;~4V$N;O4|$d=*4|$NA08e$K(B Linux $B0J30$N(B OS $B$r5/F0$7$F;~4VD4@0$7$F$$$J$$>l9g$G$"$C$F$b!"(B <B CLASS="COMMAND" >hwclock</B > $B$O!"(BRTC $B$,(B $B$$$D$b@5$7$$%m!<%+%k%?%$%`$rI=<($7$F$$$k$H2>Dj$7$J$1$l$P$J$i$J$$$o$1$G$9!#(B</P ><P >$B2F;~4VD4@0$N;O4|$d=*4|$NA08e$K(B Linux $B$,F0$$$F$$$?>l9g!"%7%9%F%`%/%m%C%/<+BN$O(B $B1F6A$r<u$1$J$$$o$1$G$9$7!"%"%W%j%1!<%7%g%s$b@5$7$$;~9oJQ49$r$9$k$G$7$g$&!#(B $B$7$+$7!"2?$i$+$NM}M3$G(B Linux $B$r:F5/F0$7$J$1$l$P$$$1$J$$>l9g!"(B $B%7%9%F%`%/%m%C%/$O(B RTC $B;~4V$K9g$o$;$F@_Dj$5$l$^$9!#$=$N>l9g!"(B $B%7%9%F%`%/%m%C%/$OB>$N(B OS ($BDL>o$O(B Windows) $B$,<B9T$5$l$k$^$G(B $B;~9o$,(B 1 $B;~4V68$C$F$7$^$$$^$9!#(B</P ><P >$B$3$l$KBP=h$9$kJ}K!$O$J$$$N$G$9$,!"(BLinux $B$O$a$C$?$J$3$H$G$O%/%i%C%7%e(B $B$7$J$$$N$G!"%G%e%"%k%V!<%H%7%9%F%`$G%j%V!<%H$r$+$1$k$N$O(B $B$?$$$F$$(B Linux $B$+$iB>$N(B OS $B$K@Z$jBX$($k$?$a$G$9!#$7$+$7!"(B $B$b$7D9;~4V%3%s%T%e!<%?$r;H$o$J$$$H$-$KEE8;$r@Z$k%?%$%W$N?M$J$i!"$D$^$j(B $B2F;~4VD4@0$NJQ99$,$"$C$F$bB>$N(B OS $B$r;H$&5!2q$,$J$+$C$?$J$i!"(B $BB>$N(B OS $B$rAv$i$;$k$^$G(B RTC $B$O0l;~4V68$&$3$H$K$J$k$N$rK:$l$J$$$G(B $B$/$@$5$$!#(B</P ><P >$B2r@b=q$N$J$+$K$O!"(BRTC $B$r(B UTC $B$K@_Dj$9$k$3$H$G(B Linux $B$,(B DST $B$r>e<j$/(B $B07$($k$h$&$K$J$k$H@bL@$7$F$$$k$b$N$,$"$j$^$9!#$3$l$OA4$/$N4V0c$$(B $B$G$O$J$$$G$9$,!"IT@53N$G$9!#%j%V!<%H$r$7$J$$8B$j!"(B(RTC $B$N%P%C%F%j!<(B $B$,@Z$l$F$$$?>l9g$G$b!"(B) RTC $B$,$I$A$i$N;~4V$rI=<($7$F$$$k$+$OLdBj(B $B$K$J$j$^$;$s!#(BLinux $B$O!"%j%V!<%H$,$+$+$k$^$G$O$$$:$l$+$NJ}K!$G(B $B@5$7$$;~4V$rI=<($7$F$$$k$o$1$G$9!#M}O@E*$K$O!"$b$70lG/$K0l2s$7$+(B $B%j%V!<%H$7$J$$$J$i(B($B$3$l$O!"(BLinux $B$N>l9g!"FC$KDA$7$$$3$H$G$O(B $B$"$j$^$;$s(B)$B!"(BDST $B$,LdBj$K$J$k>l9g$G$b%7%9%F%`%/%m%C%/$O$:$C$H(B $B@53N$J;~4V$rEA$($F$$$k$N$G!"(BRTC $B$,68$C$?$H$7$F$b2?%v7n$b5$IU$+$J$$(B $B$G$7$g$&!#$7$+$7!"$$$D%j%V!<%H$r$9$k$+$H$$$&$3$H$OM=$aM=B,$,IU$+$J$$(B $B$N$G!"%m!<%+%k%?%$%`$rI,MW$H$9$k(B OS $B$r;H$C$F$$$J$$>l9g$O!"(B RTC $B$r(B UTC $B$K@_Dj$7$?J}$,$$$$$G$7$g$&!#(B</P ><P >Dallas Semiconductor $B$N(B RTC $B%A%C%W(B ($B$3$l$O!"(BMotorola $B%A%C%W$NBe$o$j$K(B IBM AT $B5!$d$=$N8_495!$KEk:\$5$l$k$h$&$K$J$C$?%A%C%W$G$9(B) $B$O!"<B:]$K(B $B%A%C%W<+BN$K(B UTC $B$r(B DST $B$KJQ49$9$kG=NO$,Hw$o$C$F$$$^$9$,!"JQ99$9$Y$-(B $BF|IU$,$"$i$+$8$a%O!<%IE*$K8GDj$5$l$F$$$F$=$l$r%=%U%HE*$KJQ$($k$3$H$,(B $B$G$-$J$$$N$G!"$3$N5!G=$O;H$o$l$F$$$^$;$s!#:G?7$N%P!<%8%g%s99?7$,(B 2000$BG/(B4$B7n$NBh0lF|MKF|$H(B 10$B7n$N:G=*F|MKF|$K<B;\$5$l$^$7$?$,!"$=$l(B $B0JA0$N%P!<%8%g%s$N%A%C%W$G$O!"$=$l$>$l0[$J$C$?F|;~$,;H$o$l$F$$$^$9!#(B ($B$^$?!"$3$l$O(B($B9g=09q$H(B)$B0c$&F|IU$r;H$C$F$$$k9q$G$O!"L@$i$+$K5!G=$7$^$;$s!#(B) $B$5$i$K!"(BRTC $B$O(B ($BC1BN$N%A%C%W$G$O$J$/(B) $B%^%6!<%\!<%I$N%A%C%W%;%C%H$N(B $BCf$KAH$_9~$^$l$F$$$k>l9g$bB?$/$J$C$F$$$k$N$G!"$=$l$i$9$Y$F$,$3$N(B $BG=NO$r;}$C$F$$$k$+$I$&$+Cx<T$K$OJ,$+$j$^$;$s!#(B</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN136" >2.4. $B%?%$%`%>!<%s$N@_Dj$K$D$$$F(B</A ></H2 ><P >$B$*$=$i$/(B Linux $B%$%s%9%H!<%k$N:]$K!"FI<T$O%?%$%`%>!<%s$r@5$7$/(B $B@_Dj$7$F$$$k$H;W$$$^$9!#$7$+$7!"$b$72?$i$+$NM}M3$G$=$l$r(B $BJQ99$7$J$1$l$P$J$i$J$$>l9g!"$b$7$/$O(B DST $B$K4X$9$k<+9q$NK!N'$,(B $BJQ99$5$l$?>l9g(B($B$3$&$$$&K!N'JQ99$,IQHK$K5/$3$k9q$b$"$j$^$9(B)$B!"(B $B%?%$%`%>!<%s$rJQ99$9$kJ}K!$rCN$kI,MW$,@8$8$k$G$7$g$&!#(B $B%7%9%F%`;~4V$,$-$C$+$j?t;~4V$:$l$F$$$k$h$&$J$H$-$O!"(B $B%?%$%`%>!<%s(B ($B$b$7$/$O!"(BDST) $B$N@_Dj$KLdBj$,$"$j$^$9!#(B</P ><P >$B%?%$%`%>!<%s$d(B DST $B$N>pJs$O!"(B<TT CLASS="FILENAME" >/usr/share/zoneinfo</TT > ($B$b$7$/$O(B <TT CLASS="FILENAME" >/usr/lib/zoneinfo</TT >) $B$KJ]B8$5$l$F(B $B$$$^$9!#%m!<%+%k$J%?%$%`%>!<%s$O!"(B<TT CLASS="FILENAME" >/etc/localtime</TT > $B$+$i>e5-$N%U%!%$%k72$N$R$H$D$K%7%s%\%j%C%/%j%s%/$rD%$k$3$H$G7hDj(B $B$5$l$F$$$^$9!#%?%$%`%>!<%s$rJQ99$9$k$K$O!"$=$N%j%s%/$rD%$jBX$((B $B$^$7$g$&!#$b$7(B DST $B$NF|IU$,JQ$o$i$J$$>l9g$O!"$=$N%U%!%$%k$rJT=8$9$k(B $BI,MW$,$"$j$^$9!#(B</P ><P >$B$^$?!"4D6-JQ?t(B <TT CLASS="ENVAR" >TZ</TT > $B$r;H$C$F8=:_$N%?%$%`%>!<%s$rJQ99$9$k$3$H$b(B $B$G$-$^$9!#$3$l$O0[$J$k%?%$%`%>!<%s$K$"$k1s3V%^%7%s$K%m%0%$%s$7$F$$$k(B $B>l9g$K$O!"JXMx$JJ}K!$G$9!#>\$7$/$O!"(B<B CLASS="COMMAND" >tzset</B > $B$H(B <B CLASS="COMMAND" >tzfile</B > $B$N%^%K%e%"%k%Z!<%8$r$4Mw$/$@$5$$!#(B</P ><P >$B$3$l$K$D$$$F$O!"<!$N%5%$%H$GJ,$+$j0W$/@bL@$5$l$F$$$^$9!#(B <A HREF="http://www.linuxsa.org.au/tips/time.html" TARGET="_top" >http://www.linuxsa.org.au/tips/time.html</A ></P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN149" >2.5. $B$I$NDxEY$N@:EY$,I,MW$+(B</A ></H2 ><P >$B%_%jICC10L$G$N@53N$5$,ITMW$J$i!"(B<B CLASS="COMMAND" >hwclock(8)</B > $B$H(B <B CLASS="COMMAND" >adjtimex(8)</B > $B$@$1$G$*$=$i$/=<J,$G$9!#%?%$%`%5!<%P$dEEGH;~7W(B $BEy$KL4Cf$K$J$C$?$H$7$F$bL5M}$O$"$j$^$;$s$,!"Cx<T$O8E$$(B <B CLASS="COMMAND" >clock(8)</B > $B%W%m%0%i%`$@$1$G$3$3?tG/$9$P$i$7$$7k2L$rF@$F$$$^$9!#(B $BB>J}!"(BLAN $B>e$KJ#?t$N%^%7%s$,$"$k>l9g$O!"8_$$$K;~7W$r<+F0E*$KF14|$5$;$k(B $B$3$H$,$G$-$l$PJXMx$G$9(B($B$"$k$$$O!"$=$l$,IT2D7g$J>l9g$b$"$j$^$9(B)$B!#$=$l0J30(B $B$K$b!"FC$KI,MW$,$J$/$F$b;H$C$F$_$FLLGr$$%D!<%kN`$b$"$j$^$9!#(B</P ><P >Linux $B$@$1$7$+Av$i$;$J$$%^%7%s$J$i$P!"(BRTC $B$r(B UTC ($B$b$7$/$O(B GMT) $B$K(B $B@_Dj$7$^$7$g$&!#(BRTC $B$r%m!<%+%k%?%$%`$K@_Dj$9$kI,MW$N$"$k%G%e%"%k%V!<%H(B $B%7%9%F%`$N>l9g$O!"Cm0U$9$Y$-E@$,$"$j$^$9!#$b$72F;~4V$NJQ99A08e$K(B Linux $B$r%j%V!<%H$7$J$1$l$P$J$i$J$$$H$-$O!";~7W$,;CDjE*$K0l;~4V$:$l$F$7$^$&$3$H$,(B $B$"$k$H$$$&$3$H$G$9!#$=$N>uBV$O!"$b$&0l$D$N(B OS $B$r5/F0$9$k$^$GB3$/$3$H$K$J$j(B $B$^$9!#(B3 $B$D0J>e$N(B OS $B$,:\$C$F$$$k>l9g$O!"$=$N$&$A$R$H$D$N(B OS $B$@$1$G(B DST $B$r(B $BD4@0$9$k$h$&5$$rIU$1$F$/$@$5$$!#(B</P ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="introduction.html" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="software.html" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >$B$O$8$a$K(B</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >$B%=%U%H%&%'%"(B</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
