Calculate the datetimes of the model timesteps

        times should start at 0 and be in seconds

def get_time_objects_from_model_timesteps(cls, times, start):
        """
        Calculate the datetimes of the model timesteps

        times should start at 0 and be in seconds

        """
        modelTimestep = []
        newtimes = []

        for i in xrange(0, len(times)):
            try:
                modelTimestep.append(times[i+1] - times[i])
            except StandardError:
                modelTimestep.append(times[i] - times[i-1])
            newtimes.append(start + timedelta(seconds=times[i]))
      
        return (modelTimestep, newtimes)