This doesn't change what gettimeofday(2) gives you (and actually you can't even use ptrace easily to fake the time of day because gettimeofday(2) isn't a real syscall -- it's actually implemented as a read from the vDSO page the kernel maps into every process).
Comments
You can't change time in container, but it's possible to change timezone files.
With generating fake timezones it is possible to change time in container.
This doesn't change what gettimeofday(2) gives you (and actually you can't even use ptrace easily to fake the time of day because gettimeofday(2) isn't a real syscall -- it's actually implemented as a read from the vDSO page the kernel maps into every process).