In our core system, there are 3 Sun Fire V120. Two of them are running Solaris 9 and the remaining system running Solaris 8. The timezone of Solaris 9 are already set to Asia/Jakarta because these were installed by me whereas the Solaris 8 was installed by previous engineer and the timezone was set to GMT.

I want to synchronise this machine to an NTP server but because the timezone was set to GMT, the time we get was not in Jakarta timezone (GMT+7), so this tutorial is written to help you how to change timezone to GMT+7 in Solaris operating system.