A custom function to calculate the total distance since Sunday (exclude today's).

To return a different unit (for example, mile), change the last line of the custom function to:

  return rtn / 160900.0;

You can change the started date to Monday by changing the variable from_dayOfWeek to 2.

To add today's distance into this custom function, add the following line before the last line.

  rtn += ActivityMonitor.getInfo().distance;