code: public static Date addMinutes(Date date, int iMinutes ) {
      Calendar dateTime = dateToCalendar(date);
      dateTime.add(Calendar.MINUTE, iMinutes);
      return dateTime.getTime();
    }
docs: Adds the specified (signed) amount of minutes to the given date. For
  example, to subtract 5 minutes from the current time of the date, you can
  achieve it by calling: <code>addMinutes(Date, -5)</code>.
  
  @param date     The time.
  @param iMinutes The amount of minutes to add.
  
  @return A new date with the minutes added.