Change system date time in Docker containers without impacting host

Question

Is it possible to change the system time in Docker containers without changing the host itself?

We are using Docker containers for testing which are sometimes time se

Answer 1

Just a follow up for those looking to have different datetime in Docker containers, https://github.com/wolfcw/libfaketime should probably be able to do the job.

Answer 2

Simple:

Steps:

1. First check the localtime of the docker container:

   [root@locdb oracle]# zdump /etc/localtime
   /etc/localtime  Tue May 22 13:59:40 2018 UTC
   

2. Check the timezones like below:

   [root@locdb oracle]# zdump /usr/share/zoneinfo/* | tail -10
   /usr/share/zoneinfo/UTC          Tue May 22 14:01:21 2018 UTC
   /usr/share/zoneinfo/Universal    Tue May 22 14:01:21 2018 UTC
   /usr/share/zoneinfo/W-SU         Tue May 22 17:01:21 2018 MSK
   /usr/share/zoneinfo/WET          Tue May 22 15:01:21 2018 WEST
   /usr/share/zoneinfo/Zulu         Tue May 22 14:01:21 2018 UTC
   /usr/share/zoneinfo/iso3166.tab  Tue May 22 14:01:21 2018
   /usr/share/zoneinfo/posix        Tue May 22 14:01:21 2018
   /usr/share/zoneinfo/posixrules   Tue May 22 10:01:21 2018 EDT
   /usr/share/zoneinfo/right        Tue May 22 14:01:21 2018
   /usr/share/zoneinfo/zone.tab     Tue May 22 14:01:21 2018
   

3. Copy the one that you need for example :

   cp  /usr/share/zoneinfo/UTC /etc/localtime