Java 计算两个日期相差的天数

最新推荐文章于 2024-01-29 14:40:30 发布

最新推荐文章于 2024-01-29 14:40:30 发布 · 241 阅读

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#SimpleDateFormat #Calendar #parse #format

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本文介绍了使用Java处理日期的方法，包括格式化日期、解析日期字符串以及计算两个日期之间的天数差。


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));   
    }

}