把字符串“20070730”转换成日期类型，与当前日期比较，打印出日差

Question

把字符串“20070730”转换成日期类型，与当前日期比较，打印出日差

Answer 1

Calendar calendar=Calendar.getInstance();
calendar.set(2007,6,30);
long timeone=calendar.getTimeMillis();
calendar.set(calendar.get(Calendar.YEAR),(calendar.get(Calendar.MONTH))+1,calendar.get(Calendar.DAY_OF_MONTH));
long timetwo=calendar.getTimeMillis();
long time=(timetwo-tiemone)/(1000*60*60*24);
System.out.println("日差："+time);

Answer 2

try {
    SimpleDateFormat sf = new SimpleDateFormat("yyyyMMdd");
    Date date1 = sf.parse("20070730");
    Calendar c1 = Calendar.getInstance();
    c1.setTime(date1);
    Calendar c2 = Calendar.getInstance();
    int count = 0;
    while (c1.before(c2)) {
        count++;
        c1.add(Calendar.Date, 1);
    }
    System.out.println("days is " + count);
} catch (Throwable e) {
    e.printStackTrance();
}

Answer 3

try { 
    SimpleDateFormat sf = new SimpleDateFormat("yyyyMMdd"); 
    Date date1 = sf.parse("20070730"); 
    Calendar c1 = Calendar.getInstance(); 
    c1.setTime(date1); 
    Calendar c2 = Calendar.getInstance(); 
    int count = 0; 
    while (c1.before(c2)) { 
        count++; 
        c1.add(Calendar.Date, 1); 
    } 
    System.out.println("days is " + count); 
} catch (Throwable e) { 
    e.printStackTrance(); 
} 
Calendar calendar=Calendar.getInstance();
calendar.set(2007,6,30);
long timeone=calendar.getTimeMillis();
calendar.set(calendar.get(Calendar.YEAR),(calendar.get(Calendar.MONTH))+1,calendar.get(Calendar.DAY_OF_MONTH));
long timetwo=calendar.getTimeMillis();
long time=(timetwo-tiemone)/(1000*60*60*24);
System.out.println("日差："+time);
两者的算法都类似。都可以

Answer 4

Timestamp  valueOf
public static Timestamp valueOf(String s)将使用 JDBC 时间戳转义格式的 String 对象转换为 Timestamp 值。 参数：
s - 使用 yyyy-mm-dd hh:mm:ss.fffffffff 格式的时间戳 
返回：
相应的 Timestamp 值 
抛出： 
IllegalArgumentException - 如果给定的参数不具有 yyyy-mm-dd hh:mm:ss.fffffffff 格式
--------------------------------------------------------------------------------------------
Timestamp t1 = Timestamp.valueOf("2008-07-30 00:00:00");
Timestamp t2 = Timestamp.valueOf("2006-08-10 00:00:00");
long gapTime = t1.getTime() - t2.getTime();
System.out.println(gapTime);
long gapDay = gapTime / (24 * 3600 * 1000);
System.out.println("差距天数为:" + gapDay);

Answer 5

这个：import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;public class TranDate {
@SuppressWarnings("deprecation")
public static void main(String[]args){
SimpleDateFormat df=new SimpleDateFormat("yyyyMMdd");
String s="20070730";
Date dt = null;
try {
dt = df.parse(s);
} catch (ParseException e) {
e.printStackTrace();
}
Calendar c1 = Calendar.getInstance(); 
c1.setTime(dt); 
Calendar c2 = Calendar.getInstance(); 
System.out.println(c1.getTime().toLocaleString());
System.out.println(c2.getTime().toLocaleString());
long t1=c1.getTimeInMillis();
long t2=c2.getTimeInMillis();
System.out.print((t2-t1)/(1000*60*60*24));


}}

Answer 6

Timestamp  valueOf 
public static Timestamp valueOf(String s)将使用 JDBC 时间戳转义格式的 String 对象转换为 Timestamp 值。 参数： 
s - 使用 yyyy-mm-dd hh:mm:ss.fffffffff 格式的时间戳 
返回： 
相应的 Timestamp 值 
抛出： 
IllegalArgumentException - 如果给定的参数不具有 yyyy-mm-dd hh:mm:ss.fffffffff 格式 
-------------------------------------------------------------------------------------------- 
Timestamp t1 = Timestamp.valueOf("2008-07-30 00:00:00"); 
Timestamp t2 = Timestamp.valueOf("2006-08-10 00:00:00"); 
long gapTime = t1.getTime() - t2.getTime(); 
System.out.println(gapTime); 
long gapDay = gapTime / (24 * 3600 * 1000); 
System.out.println("差距天数为:" + gapDay);

Answer 7

[align=center]一楼写错了.不应该先赋值再得到值.那样算是算不出来的.
Calendar calendar=Calendar.getInstance();
calendar.set(calendar.get(calendar.YEAR),calendar.get(calendar.MONTH)+1,calendar.get(calendar.DATE));
long timeNow=calendar.getTimeInMillis();
calendar.set(2007, 07, 30);
long timeOld=calendar.getTimeInMillis();
System.out.println((timeNow-timeOld)/(60*60*24*1000));[/align]