[ubuntu] System time changes after booting into Ubuntu (dual boot system with win xp)

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http://ubuntuforums.org – Hi, I have a strange problem with regards to the system time. I am situated in Mumbai, India, which is +5.30 hours time zone (no daylight savings). I have windows xp installed on one hard drive and Ubuntu 12.10 installed on the other hard drive (installed each OS disconnecting the other hard drive; Use the boot menu using F12 to boot into each OS). I use win xp most of the times since my work requires me to be on win xp. I have a strange problem with regard to the system time. When I boot into Ubuntu, the system time shows correct, but after booting into Ubuntu, if I restart the machine an (Hardware)