To prepare your old Open Server V systems for upcoming US Daylight
Savings Time, do one of the followings:

1. Enter the command tz and answer n to the questions Is your system in
North America. After that, answer the questions accordingly.

2. vi /etc/TIMEZONE and append ,M3.2.0,M11.1.0 to the line TZ=xxxnxxx.
For example change TZ=PST8PDT to TZ=PST8PDT,M3.2.0,M11.1.0.