.\"
.\" Japanese Version Copyright (c) 1997 NAKANO Takeo all rights reserved.
.\" Translated Mon Dec 8 1997 by NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated & Modified Fri 3 Jul 1998 by NAKANO Takeo
.\" Updated & Modified Thu 14 Oct 1999 by NAKANO Takeo 
.\" Updated & Modified Sat 18 Mar 2000 by NAKANO Takeo
.\" Updated & Modified Wed 14 Jun 2000 by NAKANO Takeo 
.\" Updated & Modified Sun Jan  7 22:17:11 JST 2001
.\"         by Yuichi SATO <ysato@h4.dion.ne.jp>
.\" Updated & Modified Mon Apr  9 20:47:39 JST 2001 by Yuichi SATO
.\" Updated & Modified Mon Jun 25 22:38:36 JST 2001 by Yuichi SATO
.\" Updated & Modified Sat Jul  6 03:56:54 JST 2002 by Yuichi SATO
.\"
.\"WORD:	epoch		(ǯ)
.\"
.TH HWCLOCK 8 "02 March 1998"
.SH ̾
hwclock \- ϡɥå (RTC) ɤ߼Ԥ
.SH 
.BR "hwclock \-r" " or " "hwclock \-\-show"
.br
.BR "hwclock \-w" " or " "hwclock \-\-systohc"
.br
.BR "hwclock \-s" " or " "hwclock \-\-hctosys" 
.br
.BR "hwclock \-a" " or " "hwclock \-\-adjust"
.br
.BR "hwclock \-v" " or " "hwclock \-\-version"
.br
.B "hwclock \-\-set \-\-date=newdate"
.br
.B "hwclock \-\-getepoch"
.br
.B "hwclock \-\-setepoch \-\-epoch=year"
.PP
¾Υץ:
.PP
.B "[\-u|\-\-utc]  \-\-localtime  \-\-noadjfile \-\-directisa"
.B "\-\-test [\-D|\-\-debug]"
.PP
DEC Alpha ѤΤͤΤ륪ץ:
.PP
.B "[\-A|\-\-arc] [\-J|\-\-jensen] [\-S|\-\-srm] [\-F|\-\-funky-toy]"
.PP
٤ƤΥץ¾ȶ̤ĤϰϤˤṳ̂뤳ȤǤ롣
.PP
ޤ \-h ϥإץåɽ롣

.SH 
.B hwclock
ϥϡɥå˥뤿ΥġǤ롣
ߤλɽꤷؤΥϡɥåꡢ
ϡɥå򥷥ƥ˹碌 (Ӥε)
Ȥäǽġ
.PP
.B hwclock
Ū˼¹Ԥϡɥåλ֤ơ
פε§Ūʤ (systematic drift) 뤳ȤǤ
(systematic drift ȤϡåäƤ줿Ȥ
в֤㤷ƻ郎븽ݤΤ)

.SH ץ
ʲΥץ
.B hwclock
ˤɤεǽ¹Ԥ뤫ΤǡɬĤꤹ롣
.PP
.TP
.B \-\-show
ϡɥåɤǻɸϤɽ롣
ɽϾ˥롦Ǥ롣
ϡɥåˤƤƤɽϥ롦Ǥ롣
.B \-\-utc
ץʬ򻲾Ȥ뤳ȡ

.TP
.B \-\-set
ϡɥå
.B \-\-date
ץˤäƻꤷꤹ롣
.TP
.B \-\-hctosys
ƥࡦåϡɥå˹碌롣

Ʊ˥ͥ뤬ĥॾͤ
Υॾ˥åȤ롣
ΤȤ TZ Ķѿ
.I /usr/share/zoneinfo
Ƥ
.BR tzset (3)
Ʊ褦˲ᤷƻȤ롣
ͥΥॾ obsolete ʥեɤǤ
tz_dsttime  DST_NONE ꤵ롣
(ΥեɤĤựƤƤ˴ؤƤ
.BR settimeofday (2)
򻲾ȤΤȡ)

ΥץϥƥεưץȤΰѤȤ褤
.TP
.B \-\-systohc
ϡɥå򸽺ߤΥƥࡦå˹碌롣
.TP
.B \-\-adjust
Ǹ˥ϡɥå碌ηв֤Ф롢
פε§Ūʤ뤿ˡ
λ֤ϡɥåλ狼롣
ܺ٤ϰʲε򻲾ȤΤȡ
.TP
.B \-\-getepoch
ɸϤˡͥ뤬ݻƤϡɥåεǯ
(epoch value) ɽ롣
βǯϡɥå
0 ǯȤƻȤ뤫򼨤ͤǤ롣
㤨Сϡɥåǯ󥿤
1952 ǯʹߤηвǯѤƤˤϡ
ͥǤΥϡɥåǯ 1952 ǤʤФʤʤ

εǯͤϡ
hwclock ϡɥåɤ߽񤭤ȤѤ롣
.TP
.B \-\-setepoch
ͥΥϡɥåǯͤ
.B \-\-epoch
ץǻꤷͤꤹ롣
ܺ٤
.B \-\-getepoch
ץ򸫤衣
.TP
.B \-\-version
.B hwclock
ΥСɸϤɽ롣
.TP
.B \-\-date=date_string
.B \-\-set
ץꤷϡΥץꤷʤФʤʤ
.B \-\-set
ץ󤬻ꤵƤʤСΥץ̵뤵롣
ϡɥå碌ꤹ롣
ΥץͿͤ
.BR date (1)
ץΰƱǤ롣㤨аʲΤ褦ˤ롣
.sp
.I hwclock \-\-set \-\-date="9/22/96 16:45:05"
.sp
ϥ륿Ϳ롣
ϡɥåˤƤǤ⡢Ǥ롣
.B \-\-utc
ץʬ򸫤衣

.\"  :-p
.B \-\-setepoch
ץꤷϼΥץɬפǤ롣
.TP
.B \-\-epoch=year
ϡɥåεǯꤹ롣
ʤǯΤĤ
ϡɥåǯ󥿤 0 б뤫ꤹ롣
Υץϡ--setepoch ץȤȤ˻Ȥä硢
ͥγǰǤϡɥåεǯꤹ롣
--setepoch ץȤȤ˻Ȥʤϡ
ľ ISA Ѥ뵪ǯꤹ롣

㤨СDigital Unix ޥǤϰʲΤ褦ˤ롣
.sp
.I hwclock \-\-setepoch \-\-epoch=1952

.PP
ΥץϤۤȤɤεǽƱѤ뤳ȤǤ롣
.TP
.B \-\-utc
.TP
.B \-\-localtime
ϡɥå (Universal Coordinated Time: UTC) 
륿Τɤˤ뤫 (Ƥ뤫) ꤹ롣
UTC ˤ뤫륿ˤ뤫ϥ桼򤷤
פˤϤɤ򤷤ϿϤʤ
äơ桼ϤΥץǼʬ
.B hwclock
ʤФʤʤ

λְäۤˤ (뤤ϥǥեȤ򴪰㤤
ξȤꤷʤä) ȡϡɥå
åؤ䤤碌η̤ϤˤʤäƤޤ

.BR \-\-utc "  " \-\-localtime
ꤷʤäΥǥեȤϡǸ
.B hwclock
Ȥäƻפ碌Ȥ
(Ĥޤ
.BR \-\-set ", " \-\-systohc ", " \-\-adjust
ץꤷƤμ¹ԤȤ)
˻ꤷƤˤʤ롣
ΤȤ adjtime ե˵ϿƤ롣
adjtime ե뤬ʤäȤΥǥեȤϥ륿ˤʤ롣

.TP
.B \-\-noadjfile
.I /etc/adjtime
ˤä󶡤뵡ǽ̵ˤ롣
ΥץȤȡ
.B hwclock

.I /etc/adjtime
ɤ߹ߤ񤭹ߤ⤷ʤ
ΥץȤȤϡ
.B \-\-utc
ޤ
.B \-\-localtime
ꤷʤФʤʤ

.TP
.B \-\-directisa
ΥץϡISA ޥޤ
.RB ( hwclock
齼ʬ ISA ޥ˸ ISA λͤ)
Alpha ޥǤΤ̣߰ġ
¾ΥޥǤϸ̤ʤ
Υץ
.B hwclock
˻ᤷơϡɥåؤΥ
ľ I/O ̿Ѥ褦ˤ롣Υץꤷʤȡ
.B hwclock
 /dev/rtc ǥХѤ褦Ȥ (/dev/rtc  rtc ǥХɥ饤
ǶưƤ뤳Ȥꤹ)ǥХɤ߹ߥץǤʤ
ϡˤľ I/O ̿Ѥ롣

rtc ǥХɥ饤Ф Linux ꡼ 2 鸽줿
.TP
.B \-\-badyear
ϡɥå1994-1999 ǯγ¦ǯݻǤʤȤ򼨤
 BIOS ˤ꤬ (4/26/94  5/31/95
δ֤줿ۤȤɤ Award BIOS Ǥ)
1999 ǯʹߤǯ򰷤ȤǤʤΤǤ롣ǯʬ
94 ̤ (ˤäƤ 95 ̤) ꤷ褦Ȥȡ
ºݤˤ 94 (ޤ 95) ꤵƤޤ
Τ褦ʥޥǤϡ
.B hwclock
ǯ 1999 ʹߤǤޤåͤ
̾Τ褦ͤȤƤѤ뤳ȤǤʤ

 BIOS 򹹿ΤФɤǤʤ
ˤϡΥޥѤȤ
.B \-\-badyear
ץꤹ뤳ȡ
.B hwclock
ϡʬƬΥ줿å򰷤äƤ뤳ȤΤȡ
ϡɥåǯʬ̵뤷
adjtime եΡֺǽ׹碌աפ
ߤǯꤷ褦Ȥ롣ưԤ碌ˤϡ
.I hwclock \-\-set
ޤ
.I hwclock \-\-systohc
򾯤ʤȤǯ˰ϼ¹Ԥۤɤ!

.B hwclock
ϡϡɥåɤ߹߻ˤǯ̵ͤ뤹뤬
ˤǯꤹ롣 1995, 1996, 1997, 1998 
줫ȤʤꡢǯΥ˹礦ǯ򤵤롣
Τ褦ˤơϡɥå˱ΤǤ롣
֤ϡɥåꤻ˰ǯʾ
ưĤŤȡεǽư򼺤Ȥˤʤ롣

ϡɥå 1994 ޤ 1995 ˤʤäƤȡ
.B hwclock

.B \-\-badyear
ɬפǤϤʤȤٹȯ롣

.TP
.B \-\-srm
Υץ
.B \-\-epoch=1900

SRM 󥽡 Alpha ǺǤŪʵǯꤹΤ˻Ȥ롣
.TP
.B \-\-arc
Υץ
.B \-\-epoch=1980

ARC 󥽡 Alpha ǺǤŪʵǯꤹΤ˻Ȥ
( Ruffians Ǥ 1900 򵪸ǯˤƤ)
.TP
.B \-\-jensen
.TP
.B \-\-funky\-toy
 2 ĤΥץϡ
ȤäƤ Alpha ޥ󤬤ɤΤ褦ʼΤΤǤ뤫ꤹ롣
Alpha ʳǤ̵Alpha Ǥ
ºݤˤϻꤷʤƤɤ
.B hwclock
ϼʬưƤޥμʬǷǤϤǤ
(Ǥ
.I /proc
ޥȤƤ)
.RB ( hwclock
ưʤȤ狼äˤϡ
ƥʤϢơʤΥƥưΤǤ褦
ץɤǤʤ̤ƤߤƤۤ
`hwclock --debug'  `cat /proc/cpuinfo' νϤΩĤ⤷ʤ)

.B \-\-jensen 
ϡJensen ǥưƤ뤳Ȥ̣롣

.B \-\-funky\-toy 
ϡΥޥǤϻ֤ܤθΤ˥ϡɥå
UIP ӥåȤǤϤʤ UF ӥåȤȤƤ뤳Ȥ̣롣
ץ̾ "Toy" ϡޥ "Time Of Year" ǽȤäΤǤ롣

.TP
.B \-\-test
ºݤΥϡɥåι (Ӥह) ȤΤ
٤ƤưԤ
Υץ
.B \-\-debug
Ȥ߹碌
.B hwclock
ư򤹤ͭѤǤ
.TP
.B \-\-debug
.B hwclock
ǹԤäƤư˴ؤ̤ξɽ롣
εǽʣǤ뤬νϤϥץư
򤹤ǽˤʤ


.SH 


.SH Linux ƥˤ
.PP
Linux ƥˤϼפʻפ 2 ¸ߤ롣
.PP
.B ϡɥå: 
 CPU ưƤ뤹٤ƤΥȥץफ
ΩƤꡢޥŸ OFF ΤȤˤưƤ롣

ISA ƥǤϡΥå ISA ʤΰȤƤ롣
ȥץϤλפФ 1 ñ̤ɤ߽񤭤Ǥ뤬
ÿˤѲ򸡽Ф뤳ȤǤΤǡ
ºݤˤϲŪ̵٤äƤ뤳Ȥˤʤ롣
.PP
λפϰ̤˥ϡɥåꥢ륿ࡦåRTC
BIOS åCMOS åʤɤȸƤФ롣
.B hwclock
Ǥϡ֥ϡɥå (ʸǤ Hardware Clock)פѤ롣
¾̾ΤäΤȤˤʤ뤫Ǥ롣
.PP
.B ƥࡦå: 
 Linux ͥ¸ߤƤפǡ
޳ߤˤäƶưƤ
(ISA ƥǤϡ޳ߤ ISA ɸΰǤ)
ʤ Linux ưƤ֤ưʤ
ƥ UTC 1970/01/01 00:00:00 ηвÿǤ
(ñ˸ 1969 ǯληвÿǤ)
ƥǤϤʤŪ̵٤äƤ롣
.PP
Linux Ǥϥƥࡦå٤ƤδȤʤפǤ롣
ϡɥåδŪϡƥबưƤʤ֤ˤ
פưĤŤ뤳ȤǤ롣
Linux ƥϵư˰٤ϡɥå򻲾Ȥ
ƥࡦåꤹ롣
θϥϡɥåѤʤ
ISA ƥ߷оݤǤä DOS ˤƤϡ
ϡɥåĤμ»ֻפǤ뤳Ȥդ뤳ȡ
.PP
ƥࡦåˤϢ³¸ߤƤϤʤʤ
ϥƥबäƤ֤
.I date(1L)
ץ¹Ԥƻפ碌褦ʾǤƱͤǤ롣
ϡɥåˤϡƥμ¹ˤǤⲿԤäƤ褤
 Linux ưȤˡ
ϡɥå餳Ĵ줿֤Ѥ롣
ƥबäƤ֤˥ƥࡦå򥹥ࡼ˽ˤ
.I adjtimex(8)
Ѥ뤳ȤǤ롣
.PP
Linux ͥϡƥΥʥॾȤǰäƤ롣
դƤۤ \-\- 
֥ͥ뤬ʬɤΥॾˤȻפäƤ뤫פʤɡ
ïⵤˤƤʤΤǤ롣ˡॾ˴ؤץ
(餯ʻ֤ɽ褦ȤƤ) ϡ
ְܴۤ㤤ʤѤƤˡǥॾꤹ롣
Ĥޤ TZ Ķѿ
.I /usr/share/zoneinfo
ǥ쥯ȥ
.BR tzset (3)
Ƥ褦ʤǻȤΤǤ롣
ͥΥॾͤ򸫤ץ¸ߤ뤷
ͥμʬ (ե륷ƥʤ) ⤳򻲾Ȥ롣
vfat ե륷ƥʤɤǤ롣ͥΥॾ
ְͤäƤȡvfat ե륷ƥϥեΥॹפ
ꡦְäƤޤ
.PP
.B hwclock

.B \-\-hctosys
ץǥƥࡦå򥻥åȤȤ
ͥΥॾ TZ 
.I /usr/share/zoneinfo
ͤꤹ롣
.PP
ॾͤϼºݤˤ 2 Ĥʬʤ롣
1) tz_minuteswest ե: (DST Ǥʤ)
륿ब UTC 鲿ʬ٤Ƥ뤫ɽ
2) tz_dsttime: ƻ (DST) ηɽ
Ϥθ߻˱ƶ롣
 2 ܤΥեɤ Linux ǤѤ줺 0 Ȥʤ롣
.RB ( settimeofday (2)
⻲ȤΤȡ)

.SH hwclock ϡɥåإˡ
.PP
.B hwclock
ϥϡɥåμˡˡѤ롣
äȤ̤ΤϡǥХڥե /dev/rtc Ф 
I/O ԤˡǤ롣
ˡѤǤȤϸ¤ʤ
⤽ rtc ɥ饤Ф Linux ɲä줿ΤŪǶΤȤǤ롣
Ťƥˤ¸ߤʤ
DEC Alpha ư rtc ɥ饤Ф⤢뤬
Υɥ饤ФȤʤ Alpha ޥ⤿󤢤褦Ǥ
(ɾȤƤ hwclock ϥ󥰤)
.PP
ŤƥǤϡϡɥåؤΥˡ
ƥΥϡɥ˰¸Ƥ롣
.PP
ISA ƥǤϡ
.B hwclock
ϻפƤCMOS פΥ쥸ľܥ뤳ȤǤ
(ݡ 0x70  0x71  I/O Ԥ)
Ԥˤ
.B hwclock
μ¸桼 ID ѡ桼ǤʤФʤʤ
(Jensen Alpha ξϡΤ褦 I/O ̿
.B hwclock
˼¹Ԥ뤳ȤϤǤʤ
äƤξϥǥХڥե /dev/port Ѥ롣
 I/O ֥ƥؤ٥륤󥿡ե
ۤȤɤͿΤǤ롣)

ϻפ˥ˡȤƤϼ¤˾𤱤ʤˡǤ롣
桼֤ΥץǤϡΤ褦ľ I/O áꡢ
ߤػߤꤹ뤳Ȥ̾ꤵƤʤΤ顣
hwclock Ǥ줬Ȥ褦ˤƤΤϡ
Ť Linux ͥ ISA ޥȤˤϡ
줬ͣˡǤ롣

.PP
m68k ƥǤϡ
.B hwclock
ϥ󥽡ɥ饤ФȥǥХڥե
/dev/tty1 ̤ƻפ˥뤳ȤǤ롣
.PP
.B hwclock
 /dev/rtc Ѥ褦Ȥ롣εǽʤͥ
ѥ뤵Ƥꡢ/dev/rtc 򥪡ץǤʤˤϡ
.B hwclock
¾ˡ (ǽǤ) Ȥ롣
ISA  Alpha ΥޥǤϡ
.I /dev/rtc
ˡǽ餫
.B hwclock
 CMOS 쥸ľ褦˶뤳ȤǤ롣
ˤ \-\-directisa ץꤹ롣

.SH 碌ǽ
.PP
̾ϡɥåϤۤΤʤΤǤϤʤ
ΡΤפϴͽ¬ǤΤǤ롣
ʤפϰƱ֤ʤʤ뤤٤ˤΤǤ롣
§Ūʤ (systematic drift) ȸƤ֤Ȥˤ롣
.B hwclock
λ碌εǽϡε§Ūʤб̤ᡢ
ŬѤΤǤ롣
.PP
ʲưҤ٤롣
.B hwclock

.I /etc/adjtime
Ȥեݴɤ롣
Υե adjtime եȸƤ֡
.PP
adjtime ե뤬ʤ֤äϤ롣
.I hwclock \-\-set
ޥɤѤƥϡɥå򸽺ߤͤ˹碌Ȥ롣
ΤȤ
.B hwclock
 adjtime ե˸ߤλֺǸ˻׹碌
(calibration) Ԥ줿פȤƵϿ롣
˻פ 10 ÿʤȤ뤿˺Ƥ
.I hwclock \-\-set
¹Ԥ줿Ȥ롣
.B hwclock
 adjtime ե򹹿
ߤλǸ˻׹碌Ԥ줿ȤƵϿ
Ʊ 2 /Ȥͤ§ŪʤͤȤƵϿ롣
24 ֤вᤷȤ
.I hwclock \-\-adjust
ޥɤ¹Ԥȡ
.B hwclock
 adjtime ե򻲾ȤäƤ줿פϰ 2 ÿʤळȡ
פϤ礦ɰ֤ƤȤɤߤȤ롣

.B hwclock
ϥϡɥå 2 ä򺹤ߤλפ 
(adjustment) Ԥ줿ȤƵϿ롣
 24 ֤вᤷȤ
.I hwclock \-\-adjust
¹ԤС
.B hwclock
ϤޤƱȤԤ
Ĥޤ 2 ä򺹤ߤλ adjtime ե˽񤭹ࡣ
.PP
.RI ( \-\-set " ޤ " \-\-systohc
Ѥ)
פ碌뤴Ȥˡ
.B hwclock
ϵ§ŪʤƷ׻롣
ΤȤˤϡǸ˻׹礻Ԥ줿ηвᡢ
ǹԤ줿ѤƤ̡
ǸԤä狼ηв֤ʤɤȤ롣
.PP
.B hwclock 
פꤹȤˤϡ˾ʤ줬ǽ롣
줬 1 äʤˤϡפ̤ڤΤƤ롣
˺ƤԤݤˡΤ줬Ѥ 1 äۤƤС
ʬϤλ롣
.PP
ƥεư (뤤ϥƥư cron Ū)
.I hwclock \-\-hctosys
Ԥˤϡˤ
.I hwclock \-\-adjust
Ԥɤ
.PP
adjtime եϡϽ (adjustments) Ū
Ƥˤ̾Ĥ줿ߤǤ¾ξ񤭹ޤƤꡢ
hwclock ٵư졢˵ưޤǤˤξݻ롣
.PP
adjtime  ASCII եǤꡢեޥåȤϰʲ̤:
.PP
ܤϻĤοͤʤꡢ줾Ƕڤ:
1) 鷺äɽ (ư 10 ):
2) Ǹ˻׹碌뤤Ԥä 
1969 UTC ηвÿɽ (10 ):
3) 
.RB ( clock (8)
ȤθߴΤΤ)
.PP
: ͤ: Ǹ˻פ碌
1969 UTC ηвÿɽΡ
׹碌٤⤵Ƥʤäꡢλפ碌꤬ä
(㤨Фλפ碌ʹߤ˥ϡɥå
郎ʤȤ狼äȤ) ˤ 0 롣
 10 ʤǤ롣
.PP
: "UTC" ޤ "LOCAL"ϡɥå
륿ಽ򼨤
ͤ
.B hwclock
˥ޥɥ饤ꤹФĤǤ񤭲ǽǤ롣
.PP

.BR clock (8)
ǻȤäƤ adjtime ե
.B hwclock
Ǥ⤽Τޤ޻ȤȤǤ롣


.SH ͥˤϡɥåμư碌

ϡɥåͤƱΤˡ
ˡ褦ʥƥ⤢롣
Linux ͥˤϡ11 ʬȤ˥ƥ९å
ϡɥå˥ԡ褦ʥ⡼ɤ¸ߤ롣
ϡ餫줿ˡ (ntp ʤ) ǥƥ९å
ƱǤƤˤϡ褤⡼ɤǤ
(ntp ȤϡͥåȥΤɤˤ륿ॵСƥ°
Ȼפ˥ƥࡦåƱˡǤ롣RFC 1305 򸫤衣)

Υ⡼ (11 ʬ⡼ɡפȸƤ) ϡˤäͭˤޤǤ
դˤʤäƤ롣
㤨 ntp ǡǤ xntpd 
Υ⡼ɤͭˤǤΤΤҤȤĤǤ롣
դˤΤⲿ¹ԤФ褯㤨
.I hwclock \-\-hctosys
¹ԤơƥࡦåŤˡꤹС11 ʬ⡼ɤϥդˤʤ롣

⡼ɤ󤫥դĴ٤ˤϡ
.I adjtimex \-\-print
ޥɤ¹Ԥ "status" ͤ򸫤Ф褤
οͤ 64 ӥåȤ (2 ʿɽ) 0 ʤС
11 ʬ⡼ɤϥˤʤäƤ롣
ʳξϥդǤ롣

ƥब 11 ʬ⡼ɤưƤ
.I hwclock \-\-adjust

.I hwclock \-\-hctosys
¹ԤƤϤʤʤƥ򤪤Ƥޤ
.I hwclock \-\-hctosys
ưѤʤ餫ޤʤ
ѤСƥࡦåͤƱ
11 ʬ⡼ɤϤޤǡƥ९åͤˤǤ롣


.SH ISA ϡɥåΡ (Century value)

μɸˤϡISA ޥ CMOS 50 Хܤ
ߤλɸȤƤΤ롣
.B hwclock
ϡΥХȤɤ߽񤭤Ԥʤ
ʤʤ餳ΥХȤ򤽤Τ褦ˤѤƤʤޥ¸ߤ뤷
ˤƤ⤳ϼºݤˤɬפʤǤ롣
ǯʬȤСߤꤹˤϽʬǤ롣

⤷ CMOS ХȤѥ롼ȯ () 顢
.B hwclock
ΥƥʤϢƤۤ
ץղä뤳Ȥ˾ޤȤǤ뤫顣

Υ󤬰̣ĤΤϡϡɥå
"direct ISA" ˤäƥƤǤ뤳Ȥա


.SH Ķѿ
.I TZ

.SH ե
.I /etc/adjtime
.I /usr/share/zoneinfo/
(ŤƥǤ
.IR /usr/lib/zoneinfo )
.I /dev/rtc
.I /dev/port
.I /dev/tty1
.I /proc/cpuinfo

.SH Ϣ
.BR adjtimex (8),
.BR date (1),
.BR gettimeofday (2),
.BR settimeofday (2),
.BR crontab (1),
.BR tzset (3)

.SH 
.B hwclock
 1996 ǯ 9  Bryan Henderson (bryanh@giraffe-data.com) 
.I clock
Ȥ˽񤤤
.I clock
 Charles Hendrick, Rob Hooft, Haraid Koenig ˤäƽ񤫤줿
ȼռϥ˽񤫤Ƥ롣