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| Use '''`timedatectl(1)`''' to set the local timezone. | For `systemd`-capable systems, use '''`timedatectl(1)`''' to set the local timezone. Substitute `America/New_York` with your preferred configuration. |
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| timedatectl set-timezone ZONE/SUBZONE | timedatectl set-timezone America/New_York |
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| ln -sf /usr/share/zoneinfo/Zone/SubZone /etc/localtime # apply a new setting | ln -sf /usr/share/zoneinfo/America/New_York /etc/localtime }}} Some utilities will also respect a `TZ` environment variable. {{{ export TZ=America/New_York date |
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| == Date == | == Date and Time == |
System Clock in Linux
The system clock in Linux generally uses the Coordinated Universal Time (UTC) standard, as opposed to localtime.
Linux images often come with a wonky clock setting based on when the image was generated. This can cause significant issues on web servers, as signed SSL certificates are only valid within a date range.
Contents
Timezone
For systemd-capable systems, use timedatectl(1) to set the local timezone. Substitute America/New_York with your preferred configuration.
timedatectl status timedatectl list-timezones timedatectl set-timezone America/New_York
timedatectl(1) is a simple utility script; the manual equivalents roughly are...
realpath /etc/localtime ls /usr/share/zoneinfo/* ln -sf /usr/share/zoneinfo/America/New_York /etc/localtime
Some utilities will also respect a TZ environment variable.
export TZ=America/New_York date
Date and Time
Use date(1) to set the current datetime. Note that date(1) must be called by the root user to set a datetime.
# January 1st, 2020 at 12:30 sudo date 2001011230