centos 5.x time change automatically
i am using squid proxy on centos 5.x release with stable version. during installation time i fixed date time region.
it was basicaly gmt +3:00 hours. so everything was fixed, now since past few days every 24 hours it change its time automaatically. this looks like it take update somewhere from internet or internally something is mess up.
could someone guide me how to fixed permanantly date time. even either restart the machine or passing 24 hours it do never change it. etc
i do change using
advise suggest plz