title: Celery: access to time of last run of task?
body: <p>Using <a href="http://celeryproject.org/" rel="noreferrer">celery</a>, is it possible from within a task to check when the last time that task was run is?</p>
  
  <p>I'd like to implement "grab everything since the last time you were run". I can either keep track of the last run timestamp myself or hopefully get access to it from celery.</p>
  
  <p>This is from within a django project, if that makes a difference.</p>