Add minute to a date returning a new object

import java.util.Calendar;
import java.util.Date;
public class Main {
  public static Date addMinutes(Date date, int amount) {
      return add(date, Calendar.MINUTE, amount);
  }
  private static Date add(Date date, int calendarField, int amount) {
      if (date == null) {
          throw new IllegalArgumentException("The date must not be null");
      }
      Calendar c = Calendar.getInstance();
      c.setTime(date);
      c.add(calendarField, amount);
      return c.getTime();
  }
}