public static String formatDurationOnSecond(@NotNull Date startDate, @NotNull Date endDate) {
		return DurationFormatUtils.formatDuration(endDate.getTime() - startDate.getTime(), "HH:mm:ss");
	}
public static String formatDurationOnSecond ( @ NotNull Date startDate , @ NotNull Date endDate ) { return DurationFormatUtils . formatDuration ( endDate . getTime ( ) - startDate . getTime ( ) , "HH:mm:ss" ) ; }
按HH:mm:ss格式，格式化时间间隔

endDate必须大于startDate，间隔可大于1天

@see DurationFormatUtils