计算两个字符串类型的日期相差的天数或者小时数，计算日期字符串到今天的年龄

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.7.16</version>
</dependency>

	String dateStr1 = "2021-10-01";
	Date date01 = DateUtil.parse(dateStr1);
	
	String dateStr2 = "2021-11-11";
	Date date02 = DateUtil.parse(dateStr2);
	
	//相差41天
	long betweenDay = DateUtil.between(date01, date02, DateUnit.DAY);
	//相差5周，不到一周默认向下取整
	long betweenWeek = DateUtil.between(date01, date02, DateUnit.WEEK);
	
	System.out.println(betweenWeek);//41
	System.out.println(betweenDay);//5

	//年龄
	int age = DateUtil.ageOfNow("1998-12-21");
	
	System.out.println(age);//22