code: public JSONObject getByContract(String contract, String fromDate, String tillDate, HashMap<String, String> params) throws JSONException {
          return oClient.get("/team/v3/workdays/contracts/" + contract + "/" + fromDate + "," + tillDate, params);
      }
docs: Get Workdays by Contract
  
  @param   contract Contract ID
  @param   fromDate Start date
  @param   tillDate End date
  @param   params (Optional) Parameters
  @throws	JSONException If error occurred
  @return	{@link JSONObject}