I've done this command this morning:root@xxx:01:21:17:/home/xxx$ date --set 2015-08-06 02:54Thu Aug  6 02:54:00 WIB 2015root@xxx:02:54:00:/home/xxx$ hwclock --set --date=2015-08-06 02:54 later on that day, I check the clock it should be 08:00, but it shows a delay by 10 minutes:root@xxx:07:49:59:/home/xxx$ dateThu Aug  6 07:50:00 WIB 2015root@xxx:07:50:00:/home/xxx$ hwclockThu Aug  6 07:50:01 2015  .392298 secondsWhat are the possible cause of this? I'm using 64-bit ArchLinux under VirtualBox$ uname -aLinux xxx 4.0.4-2-ARCH #1 SMP PREEMPT Fri May 22 03:05:23 UTC 2015 x86_64 GNU/LinuxThe timezone is GMT+7$ date +'%:z %Z'+07:00 WIB$ strings /etc/localtime | tail -n 1WIB-7As suggested on the comment, installing ntp temporarily solves this problem:sudo pacman -S ntpsudo systemctl enable ntpdsudo systemctl start ntpdtimedatectl set-ntp truetimedatectlbut after one day, the time drifting again:      Local time: Fri 2015-08-07 23:52:10 WIB --> 30 minutes late  Universal time: Fri 2015-08-07 16:52:10 UTC        RTC time: Fri 2015-08-07 16:52:10       Time zone: Asia/Jakarta (WIB, +0700) Network time on: yesNTP synchronized: yes RTC in local TZ: no
Clock drift in a VirtualBox guest
arch linux;virtualbox;clock