Java 计算两个日期相差的天数

最新推荐文章于 2024-04-22 19:56:18 发布

techan007

最新推荐文章于 2024-04-22 19:56:18 发布

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文章标签： java java 日期 web

本文介绍了一种使用Java来计算两个日期之间相差天数的方法。通过将日期格式化并利用Calendar对象获取时间戳，进而计算出两个日期间的天数差。

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import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class test16 {
/**
* @param args
* @throws ParseException
*/
public static void main(String[] args) throws ParseException {
// TODO Auto-generated method stub
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d1=sdf.parse("2012-09-08 10:10:10");
Date d2=sdf.parse("2012-09-15 00:00:00");
System.out.println(daysBetween(d1,d2));
System.out.println(daysBetween("2012-09-08 10:10:10","2012-09-15 00:00:00"));
}
/**
* 计算两个日期之间相差的天数
* @param smdate 较小的时间
* @param bdate 较大的时间
* @return 相差天数
* @throws ParseException
*/
public static int daysBetween(Date smdate,Date bdate) throws ParseException
{
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
smdate=sdf.parse(sdf.format(smdate));
bdate=sdf.parse(sdf.format(bdate));
Calendar cal = Calendar.getInstance();
cal.setTime(smdate);
long time1 = cal.getTimeInMillis();
cal.setTime(bdate);
long time2 = cal.getTimeInMillis();
long between_days=(time2-time1)/(1000*3600*24);
return Integer.parseInt(String.valueOf(between_days));
}
/**
*字符串的日期格式的计算
*/
public static int daysBetween(String smdate,String bdate) throws ParseException{
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.setTime(sdf.parse(smdate));
long time1 = cal.getTimeInMillis();
cal.setTime(sdf.parse(bdate));
long time2 = cal.getTimeInMillis();
long between_days=(time2-time1)/(1000*3600*24);
return Integer.parseInt(String.valueOf(between_days));
}
}