import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Main {
/**
* @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"));
dateDiff("2012-09-08 00:00:00", "2012-09-08 01:00:00", "yyyy-MM-dd HH:mm:ss");
SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String nowTime=format.format(new Date());
System.out.println(nowTime);
System.out.println(24*60*60*1000);
}
/**
* 計算兩個日期之間相差的天數
*
* @param smdate
* 較小的時間
* @param bdate
* 較大的時間
* @return 相差天數
* @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計算
*/
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));
}
public static void dateDiff(String startTime, String endTime, String format) {
//按照傳入的格式生成一個simpledateformate對象
SimpleDateFormat sd = new SimpleDateFormat(format);
long nd = 1000*24*60*60;//一天的毫秒數
long nh = 1000*60*60;//一小時的毫秒數
long nm = 1000*60;//一分鐘的毫秒數
long ns = 1000;//一秒鐘的毫秒數long diff;try {
//獲得兩個時間的毫秒時間差異
long diff = 0;
try {
diff = sd.parse(endTime).getTime() - sd.parse(startTime).getTime();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
long day = diff/nd;//計算差多少天
long hour = diff%nd/nh;//計算差多少小時
long min = diff%nd%nh/nm;//計算差多少分鐘
long sec = diff%nd%nh%nm/ns;//計算差多少秒//輸出結果
long second = diff/ns;
System.out.println("時間相差:"+day+"天"+hour+"小時"+min+"分鐘"+sec+"秒。");
System.out.println(second);
}
}
計算日期的時間差
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