The true value of AceTimer comes when you have many timers. The reason why all my timers use AceTimer. It's a lot less stressful on the CPU than many OnUpdates. (Exluding places where you're updating multiple times per second)
Should be fixed now, although not sure why it was changed off acetimer. I'll be making two clocks, simple and advanced both using acetimer in the near future.
The AceTimer version was an old LDB-1.0 test plugin that got "accidentally" converted to LDB-1.1. I think for such an easy task AceTimer is too much, so it uses OnUpdate now. It's just a simple function call every 1 or 60 seconds (seconds/minutes mode).