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To correct the invalid boot time you must reboot the system. The utmp file is recreated with each boot.
To attempt to discover who or what overwrote the first entry in the file, use the following command to create a readable version of the utmp file and look at record 0:
NOTE: The fwtmp command must first be installed. For AIX Version 4, install bos.acct.
/usr/sbin/acct/fwtmp < /etc/utmp >/tmp/out
A valid entry looks something like this:
system boot 0 2 0000 0000 818538505 Sat Dec 9 13:48:25 CST 1995
Instead of the system boot entry, you will probably find an entry like:
jones pts/2 19193 7 0000 0000 818683926 Mon Dec 11 06:12:06 CST 1995
This output means that the time stamp was corrupted by whatever program jones on pts/2 used to login. A program should never overwrite the first two entries in the utmp file. You would have to talk with jones to see what he did. This is almost always caused by a third party program that is incorrectly writing to the utmp file or a corrupted file system where the data is invalid.