zeros in front of digits

/**
	 * Add zeros in front of the processed digits
	 * @param math number
	 * @param num digits
	 * @return String zero-padded data
	 */
	private String dealIntDate(int math,int num){
		return math>=0?StringUtils.leftPad(math+"", num, '0'):"-"+StringUtils.leftPad((-math)+"", num, '0');
	}