5 Mar
2011
5 Mar
'11
10:58 a.m.
On Fri, Mar 4, 2011 at 3:04 PM, Denniston, Todd A CIV NAVSURFWARCENDIV Crane todd.denniston@navy.mil wrote: [snip]
If your hwclock is off by a lot when it comes up I believe it is from one of the following: A) bad cmos battery. B) poor cmos clock C) confusing info in /etc/adjtime due to using both hwclock --adjust [at boot] and ntp (long story, but it is due to both tweaking the clock without coordination between them). D) booting a different OS with different ideas of timezones. E) manual tweaking of time via bios.
[snip]
good list.. I'd also add "F) Running inside a virtual machine."
The VMWare clock skew can be enormous. On some systems it drifts by a minute per hour if not adjusted via ntp.