You can set the antsleOS timezone by looking for your timezone in the directory /usr/share/zoneinfo. (in the antsleOS).
SSH to the antsle's command line and list the zoneinfo directories
ls /usr/share/zoneinfo
Then list the zone files in the directory within your region name. I will use my timezone in this example.
ls /usr/share/zoneinfo/America
Update the timezone config file.
echo "America/LosAngeles" > /etc/timezone
And finally update the system timezone data with
emerge --config sys-libs/timezone-data