title: Using datetime object for a scatter plot?
body: <p>I would like to construct a scatter plot, using date time objects on both axis. Namely, dates (formatted as <code>%YYYY-MM-DD</code>) will be placed on one axis, the second axis will display 24 hour scale (i.e. from 0 to 24) and contain timestamps of events (formatted as <code>%HH:MM</code> in 24-hour format), such a user logging into the server, that occurred on a given date. There could be several events on a particular date, for example, a user logging 2 or 3 times.</p>
  <p><strong>My questions:</strong> how do I use such <code>datetime</code> objects, while creating a plot using <code>matplotlib</code>? Do I need to convert them in order to feed into <code>matplotlib</code>?</p>