java两个日期相减

时间:2015-06-16
简介:java教程|java两个日期相减
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class dateCov {
 public static void main(String[] args) {
  System.out.println("相差日期为:" + dateCov.daysxiangcha("2010-10-20", "2010-12-20"));
 }
 public static int daysxiangcha(String dateStr1, String dateStr2) {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
  SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd");
  try {
   dateStr1 = sdf.format(sdf2.parse(dateStr1));
   dateStr2 = sdf.format(sdf2.parse(dateStr2));
  } catch (ParseException e) {
   e.printStackTrace();
  }
  int year1 = Integer.parseInt(dateStr1.substring(0, 4));
  int month1 = Integer.parseInt(dateStr1.substring(4, 6));
  int day1 = Integer.parseInt(dateStr1.substring(6, 8));
  int year2 = Integer.parseInt(dateStr2.substring(0, 4));
  int month2 = Integer.parseInt(dateStr2.substring(4, 6));
  int day2 = Integer.parseInt(dateStr2.substring(6, 8));
  Calendar c1 = Calendar.getInstance();
  c1.set(Calendar.YEAR, year1);
  c1.set(Calendar.MONTH, month1 - 1);
  c1.set(Calendar.DAY_OF_MONTH, day1);
  Calendar c2 = Calendar.getInstance();
  c2.set(Calendar.YEAR, year2);
  c2.set(Calendar.MONTH, month2 - 1);
  c2.set(Calendar.DAY_OF_MONTH, day2);
  long mills =
   c1.getTimeInMillis() > c2.getTimeInMillis()
    ? c1.getTimeInMillis() - c2.getTimeInMillis()
    : c2.getTimeInMillis() - c1.getTimeInMillis();
  return (int) (mills / 1000 / 3600 / 24);
 }
}

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