Sure.

>From 
>http://code.google.com/apis/visualization/documentation/gallery/annotatedtimeline.html#Data_Format
:
"You can display one or more lines on your chart. Each row represents
an X position on the chart--that is, a specific time; each line is
described by a set of one to three columns.
The first column is of type date or datetime, and specifies the X
value of the point on the chart. If this column is of type date (and
not datetime) then the smallest time resolution on the X axis will be
one day."

Edit the code playground at 
http://code.google.com/apis/ajax/playground/?type=visualization#annotated_time_line
:

to specify something like:

  data.setValue(0, 0, new Date(2008,1,1,9,23,45));
  data.setValue(1, 0, new Date(2008,1,1,10,23,45));
  data.setValue(2, 0, new Date(2008,1,1,14,23,45));
  data.setValue(3, 0, new Date(2008,1,1,15,23,45));
  data.setValue(4, 0, new Date(2008,1,1,16,23,45));
  data.setValue(5, 0, new Date(2008,1,2,18,23,45));

  annotatedtimeline.draw(data, {'displayAnnotations': true,
'dateFormat':'HH:mm MMMM dd, yyyy'});

Cheers,
Keith

P.S. - Interactive Charts has their own forum @
http://groups.google.com/group/google-visualization-api - Just an FYI

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