Timezone changed on Solaris 5.9

Hi,
Trying to figure out why the timezone's on some of our solaris 5.9 servers have changed.

We had our servers set to CEST timezone. However, they have now changed to CET (which is causing problems with all our CRON jobs). Trying to figure out how this change occurred. I check the modification time of the /etc/default/init file but it has not been modified since the server was first installed.

The /etc/default/init file is set to TZ=Europe/Stockholm which shows as CET when i run the following command:
zdump Europe/Stockholm