code: public Calendar getTime(String propName) {
          assert propName.endsWith("Time");
          if (!m_properties.containsKey(propName)) {
              return null;
          }
          Calendar calendar = new GregorianCalendar(Utils.UTC_TIMEZONE);
          calendar.setTimeInMillis(Long.parseLong(m_properties.get(propName)));
          return calendar;
      }
docs: Get the value of a time property as a Calendar value. If the given property has
  not been set or is not a time value, null is returned.
  
  @param propName  Name of a time-valued task record property to fetch.
  @return          Time property value as a Calendar object in the UTC time zone.