Patched ntp that reads an offset for the system clock from /etc/ntpoffset. The offset is applied at the libntp level so ALL ntp utilities will read and write the system clock with the set offset. It's still possible for ntpd to maintain proper sync against other servers and provide a time source to others as the modified system clock has the correct time. This file is only read once per process, so ntpd will need to be restarted: 1. service ntpd stop 2. echo "7862400" >/etc/ntpoffset # 3 months in the future 3. ntpdate pool.ntp.org 4. service ntpd start