可能重复:
how to calculate difference between two dates using java
我正在尝试这样的事情, 我试图从组合框中获取日期
Calendar start = Calendar.getInstance();
Calendar end = Calendar.getInstance();
int Sdate=Integer.parseInt(cmbSdate.getSelectedItem().toString());
int Smonth=cmbSmonth.getSelectedIndex();
int Syear=Integer.parseInt(cmbSyear.getSelectedItem().toString());
int Edate=Integer.parseInt(cmbEdate.getSelectedItem().toString());
int Emonth=cmbEmonth.getSelectedIndex();
int Eyear=Integer.parseInt(cmbEyear.getSelectedItem().toString());
start.set(Syear,Smonth,Sdate);
end.set(Eyear,Emonth,Edate);
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
String startdate=dateFormat.format(start.getTime());
String enddate=dateFormat.format(end.getTime());
我无法减去结束日期和开始日期 如何获得开始日期和结束日期之间的差异?
答案 0 :(得分:41)
Calendar start = Calendar.getInstance();
Calendar end = Calendar.getInstance();
start.set(2010, 7, 23);
end.set(2010, 8, 26);
Date startDate = start.getTime();
Date endDate = end.getTime();
long startTime = startDate.getTime();
long endTime = endDate.getTime();
long diffTime = endTime - startTime;
long diffDays = diffTime / (1000 * 60 * 60 * 24);
DateFormat dateFormat = DateFormat.getDateInstance();
System.out.println("The difference between "+
dateFormat.format(startDate)+" and "+
dateFormat.format(endDate)+" is "+
diffDays+" days.");
当穿过夏令时(或闰秒)时,这将无效,因为橙色80指出,并且在使用不同时间时可能不会给出预期结果。使用JodaTime可能更容易获得正确的结果,因为在我知道之前使用普通Java的唯一正确方法是使用Calendar的add和before / after方法来检查和调整计算:
start.add(Calendar.DAY_OF_MONTH, (int)diffDays);
while (start.before(end)) {
start.add(Calendar.DAY_OF_MONTH, 1);
diffDays++;
}
while (start.after(end)) {
start.add(Calendar.DAY_OF_MONTH, -1);
diffDays--;
}
答案 1 :(得分:24)
使用JodaTime。它比标准的Java DateTime Apis要好得多。以下是JodaTime中用于计算天数差异的代码:
private static void dateDiff() {
System.out.println("Calculate difference between two dates");
System.out.println("=================================================================");
DateTime startDate = new DateTime(2000, 1, 19, 0, 0, 0, 0);
DateTime endDate = new DateTime();
Days d = Days.daysBetween(startDate, endDate);
int days = d.getDays();
System.out.println(" Difference between " + endDate);
System.out.println(" and " + startDate + " is " + days + " days.");
}
答案 2 :(得分:14)
赞this。
import java.util.Date;
import java.util.GregorianCalendar;
/**
* DateDiff -- compute the difference between two dates.
*/
public class DateDiff {
public static void main(String[] av) {
/** The date at the end of the last century */
Date d1 = new GregorianCalendar(2000, 11, 31, 23, 59).getTime();
/** Today's date */
Date today = new Date();
// Get msec from each, and subtract.
long diff = today.getTime() - d1.getTime();
System.out.println("The 21st century (up to " + today + ") is "
+ (diff / (1000 * 60 * 60 * 24)) + " days old.");
}
}
Here是一篇关于Java日期算术的文章。