public static void setTimeZone(TimeZone newTimeZone) {
        timeZone = newTimeZone;
        if (timeFormat != null) {
            timeFormat.setTimeZone(timeZone);
        }
        if (dateFormat != null) {
            dateFormat.setTimeZone(timeZone);
        }
        if (dateTimeFormat != null) {
            dateTimeFormat.setTimeZone(timeZone);
        }
        setProperty("locale.timeZone", timeZone.getID());
    }
Sets the global time zone used by Jive. The default time zone is the VM's
time zone.

@param newTimeZone Time zone to set.
xmppserver/src/main/java/org/jivesoftware/util/JiveGlobals.java