Hora UTC

En un sistema hay dos relojes:

  • hardware clock
  • system clock

El System clock lo fijan cuatros factores:

  • El valor de la hora
  • El estándar de hora
  • Zona horaria
  • DST (dayling Saving time)

Hay dos estandares de hora:

  • localtime depende de "time zone"
  • UTC coordinated Universal Time es un estándar Global

El reloj hardware

Conocido como CMOS clock o Real Time CLOCK (RTC) 

[root@spock Europe]# hwclock --show
Wed 10 May 2017 09:27:26 AM CEST  -0.825893 seconds
#sincroniza la hora RTC con la del sistema 
[root@spock Europe]# hwclock --systohc

Reloj del sistema:

[root@spock zoneinfo]# date
Wed May 10 09:41:51 CEST 2017

[root@spock zoneinfo]# date -u
Wed May 10 07:44:11 UTC 2017

Para cambiarlo: 

[root@spock Etc]# cp /etc/localtime /etc/localtime.old

[root@spock Etc]# strings /etc/localtime
TZif2
WEST
WEMT
CEST
TZif2
WEST
WEMT
CEST
CET-1CEST,M3.5.0,M10.5.0/3}}}

[root@spock Etc]# ln -sf /usr/share/zoneinfo/UTC /etc/localtime
[root@spock Etc]# date
Wed May 10 08:03:27 UTC 2017

En España:

  • CET ( Central European Time ) GMT +1
  • CEST( Central European Sumer Time ) GMT +2

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