Table of Contents
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Time shifting issues
The switching of date because of daylight saving time can lead to a shift in time for the same file saved on multiple locations. An example is a backup. Setting the system clock and local time to UTC can solve this. See also man hwclock under ¨LOCAL vs UTC¨. The disadvantage is that your clock is not showing the actual local time any more. With a dual clock or two clocks in the tray this can be solved. Orage panel clock can be an option.
File locations
| /etc/timezone | |
| /etc/localtime | (binary file) |
Commands
| Command (as root) | Function |
|---|---|
| dpkg-reconfigure tzdata | Edit the timezone. Do not use tzconfig because it is obsolete |
| tzselect | Does the same as dpkg-reconfigure tzdata which is prefered. Is not able to set the clock to UTC |
| hwclock --show | Show the time and date as set in the hardware clock |
| date -u | Show the time and date as set in the system clock |
| hwclock --set --date "2014-11-21 19:24:35" --utc | Set the hardware clock to a time in UTC |
| hwclock --hctosys | Set the system time from the hardware clock |
Remarks:
- The hwclock --hctosys option can not be used in the same command as the hwclock --set option
- The hwclock --verbose option can be used to show a more detailed output
Errors
It can be the case that the hardware clock and the system clock do not display the same time. In that case run hwclock --hctosys
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