I use an excellent program on my 68K Macs, including my Plus web server, to set the time from an NTP server at a specified interval. Because you can also configure it to set the time at system startup, it's an excellent way to get around the dead PRAM battery issue. On my Plus that runs as a web server with a dead PRAM battery, I modified the System file in ResEdit for simple things like mouse settings, and use this control panel to maintain the date and time.
From the author:
From the author:
Download it here: http://hyperarchive.lcs.mit.edu/HyperArchive/Archive/comm/inet/network-time-201.hqx