本文实例讲述了Java判断两个日期相差天数的方法。分享给大家供大家参考。具体如下:
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import java.util.Calendar;
public class DateDifferent{
public static void main(String[] args){
Calendar calendar1 = Calendar.getInstance();
Calendar calendar2 = Calendar.getInstance();
calendar1.set( 2007 , 01 , 10 );
calendar2.set( 2007 , 07 , 01 );
long milliseconds1 = calendar1.getTimeInMillis();
long milliseconds2 = calendar2.getTimeInMillis();
long diff = milliseconds2 - milliseconds1;
long diffSeconds = diff / 1000 ;
long diffMinutes = diff / ( 60 * 1000 );
long diffHours = diff / ( 60 * 60 * 1000 );
long diffDays = diff / ( 24 * 60 * 60 * 1000 );
System.out.println( "\nThe Date Different Example" );
System.out.println( "Time in milliseconds: " + diff + " milliseconds." );
System.out.println( "Time in seconds: " + diffSeconds + " seconds." );
System.out.println( "Time in minutes: " + diffMinutes + " minutes." );
System.out.println( "Time in hours: " + diffHours + " hours." );
System.out.println( "Time in days: " + diffDays + " days." );
}
}
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把上面的代码放在项目里使用了一下,【求日期部分】是要满24小时才算一天的,不太适应项目的需求,故改成这样子。
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/**
* 得到两个日期相差的天数
*/
public static int getBetweenDay(Date date1, Date date2) {
Calendar d1 = new GregorianCalendar();
d1.setTime(date1);
Calendar d2 = new GregorianCalendar();
d2.setTime(date2);
int days = d2.get(Calendar.DAY_OF_YEAR)- d1.get(Calendar.DAY_OF_YEAR);
System.out.println( "days=" +days);
int y2 = d2.get(Calendar.YEAR);
if (d1.get(Calendar.YEAR) != y2) {
// d1 = (Calendar) d1.clone();
do {
days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);
d1.add(Calendar.YEAR, 1 );
} while (d1.get(Calendar.YEAR) != y2);
}
return days;
}
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希望本文所述对大家的java程序设计有所帮助。