Thanks for the feedback ... will try to write a bug report soon.
I just wanted to make a comment on how thrilled I am with the datetime ruler. WIth my hack, I was able to specify that the data going into the datetime object was 'UTC' but my axes was set to 'local' time which allowed me to see the data referenced to local time in the figure. Great to have reduced the headaches associated with dates and time. We also have to get them to display the object to higher precision ... the object supports much higher precision but won't display to that precision and I can't force it to do so ... I have to do some rounding and differencing to see what I want to see. (duration object rules here).