Question

java 怎么计算当前时间 到 某一给定时间的间隔天数

Answer 1

Calendar cal=Calendar.getInstance();
d=cal.get(Calendar.DATE);
使用这两个获取当前的年月日中的日，在减去给定时间的日，取绝对值即可。

Answer 2

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
//给定的时间
Date d=format.parse("2013-03-21 23:59:00");

//当前时间处理
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);

//给定时间处理
Calendar setCal = Calendar.getInstance();
setCal.setTime(d);
setCal.set(Calendar.HOUR_OF_DAY, 0);
setCal.set(Calendar.MINUTE, 0);
setCal.set(Calendar.SECOND, 0);
setCal.set(Calendar.MILLISECOND, 0);

long dayDiff =(setCal.getTimeInMillis()-cal.getTimeInMillis())/(1000*60*60*24);
System.out.println(dayDiff);

Answer 3

简直用当前时间-给定时间，就可以得出

Answer 4

当前时间就是new Date（）
你这个相当如计算两个时间之间的间隔
/**
* 获取两个时间的时间间隔
*
* @param beginDate
* 开始时间
* @param endDate
* 结束时间
* @return
*/
public static int getDaysBetween(Calendar beginDate, Calendar endDate) {
if (beginDate.after(endDate)) {
Calendar swap = beginDate;
beginDate = endDate;
endDate = swap;
}
int days = endDate.get(Calendar.DAY_OF_YEAR)
- beginDate.get(Calendar.DAY_OF_YEAR) + 1;
int year = endDate.get(Calendar.YEAR);
if (beginDate.get(Calendar.YEAR) != year) {
beginDate = (Calendar) beginDate.clone();
do {
days += beginDate.getActualMaximum(Calendar.DAY_OF_YEAR);
beginDate.add(Calendar.YEAR, 1);
} while (beginDate.get(Calendar.YEAR) != year);
}
return days;
}

Answer 5

相减就可以！