I drove home from work, turned my Roadster off, plugged it in, and the VDS said charging would begin at 9PM. Since it was a weekday, I didn't want charging to start until midnight. So, I tap the VDS, change Timing to 12AM and hit OK. VDS says charging will begin at 12AM (as I recall). 9PM comes along and my car starts charging! This is not the first time I've changed the timing only to not have it stick. What the rules about making charge programming stick? Does the key in the ignition matter? Does having the charge port door open matter? Does having the connector connected matter? Why does the obvious thing not work? Is there some greater thing I'm missing, or is this just bad UI design from Tesla?