I have two numpy arrays 1D, one is time of measurement in datetime64 format, for example:
array([2011-11-15 01:08:11, 2011-11-16 02:08:04, ..., 2012-07-0
You might want to try this:
plot_date(timeSeries, data)
By default, the x axis will be considered a date axis, and y a regular one. This can be customized.