*** This bug is a duplicate of bug 63175 ***
    https://bugs.launchpad.net/bugs/63175

Assume you are currently in China, and the hardware clock of your
computer is set to Beijing time (GMT+800) to accommodate the requirement
of Windows. After booting the feisty desktop-i386 CD,  the system clock
is the correct GMT time, which is obtained from a time server on the
network shortly after the network interface is up. When Ubiquity starts
to do the real installation job, it updates the system clock to Beijing
time, but without changing the timezone accordingly. You can notice the
time change on the Gnome Date&Time applet and confirm that the timezone
does not get updated by using the date command . This mistake makes the
system clock 8 hours ahead of the current time, and hence the last
modified/write time recorded in ext3 superblocks.

There is a loophole in the reasonings of my posts yesterday. I missed
one important thing: when the RTC device is being added upon normal
system booting, a udev rule gets applied to correctly initialize the
system clock from the hardware clock, by taking timezone into
consideration. This invalidates my conclusion about bug 63175, but on
the contrary confirms the root cause of this bug (bug 89069).

-- 
problem with time
https://bugs.launchpad.net/bugs/89069
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