On Mar 13, 2009, at 3:24 AM, "Helmut Drodofsky" <drodofsky at internet-xs.de > wrote: > Hi, > > > > the date jumps within 30 seconds to a wrong value. ntp service is > stopped at the beginning. > > > > Whereas hwclock seems more precise. > > > > [root at kerio ~]# service ntpd stop > > Shutting down ntpd: [ OK ] > > [root at kerio ~]# ntpdate 0.centos.pool.ntp.org > > 13 Mar 07:04:48 ntpdate[23003]: step time server 131.234.137.24 > offset -3450.678273 sec > > [root at kerio ~]# hwclock > > Fri 13 Mar 2009 07:04:59 AM GMT -0.014767 seconds > > [root at kerio ~]# date > > Fri Mar 13 07:05:02 GMT 2009 > > [root at kerio ~]# date > > Fri Mar 13 07:05:14 GMT 2009 > > [root at kerio ~]# date > > Fri Mar 13 08:03:01 GMT 2009 > > [root at kerio ~]# hwclock > > Fri 13 Mar 2009 07:05:37 AM GMT -0.083628 seconds > > [root at kerio ~]# > > > > /etc/ntp.conf is in original configuration. > > > > Remarks: > > - most of our servers run without X-Windows, this uses X-Windows and > Gnome. > > - the server runs kerio mail services. Even the original from kerio > configured VMWare server has had this behavior. > > - stopping of keriomailserver does not help > If your hwclock stores local time and your BIOS adjusts it for DST that would cause a 3600 second time difference or if your hwclock stores UTC and the BIOS adds an hour to that... Turn off any BIOS DST adjust feature if it's enabled. -Ross