Java 如何在android中比较日期值

我的

textview

需要显示考试死线的日期。我的

json

将其作为字符串传递。然后我需要获取当前日期并在另一个

textviwe

String date    ="2014-11-12";  //ok
Date deadline  = //how to cast string to date  
//then how to get today and subtract 
textview1.setText(today);      
int remaindays = //how to get it    
textview2.setText("You have " +remaindays  +" days to exam");

 String date = "2014-11-12";  
        SimpleDateFormat  format = new SimpleDateFormat("yyyy-MM-dd");  
        try {  
            Date date = format.parse(date);  
            System.out.println(date);  
        } catch (ParseException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
    }

---

尝试此代码

 String date    ="2014-11-12"; 
 Date deadline; 
 SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
 Date strDate = sdf.parse(date);
 Long diff=-1;
 int diff=0;
 if (System.currentTimeMillis() > strDate.getTime()) {
    diff=System.currentTimeMillis()-strDate.getTime();
 }
 int remaindays = (int)diff/100/60/60/24
 textview2.setText("You have " +remaindays  +" days to exam");

 String date = "2014-11-12";  
        SimpleDateFormat  format = new SimpleDateFormat("yyyy-MM-dd");  
        try {  
            Date date = format.parse(date);  
            System.out.println(date);  
        } catch (ParseException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
    }

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String currentDateandTime = sdf.format(new Date());

long diff = date2.getTime() - date1.getTime();
int remaindays = (int)diff/100/60/60/24

---

1。将字符串转换为最新版本

 String date = "2014-11-12";  
        SimpleDateFormat  format = new SimpleDateFormat("yyyy-MM-dd");  
        try {  
            Date date = format.parse(date);  
            System.out.println(date);  
        } catch (ParseException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
    }

2。今日获取日期

 String date    ="2014-11-12"; 
 Date deadline; 
 SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
 Date strDate = sdf.parse(date);
 Long diff=-1;
 int diff=0;
 if (System.currentTimeMillis() > strDate.getTime()) {
    diff=System.currentTimeMillis()-strDate.getTime();
 }
 int remaindays = (int)diff/100/60/60/24
 textview2.setText("You have " +remaindays  +" days to exam");

 String date = "2014-11-12";  
        SimpleDateFormat  format = new SimpleDateFormat("yyyy-MM-dd");  
        try {  
            Date date = format.parse(date);  
            System.out.println(date);  
        } catch (ParseException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
    }

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String currentDateandTime = sdf.format(new Date());

long diff = date2.getTime() - date1.getTime();
int remaindays = (int)diff/100/60/60/24

3。统计日期

 String date    ="2014-11-12"; 
 Date deadline; 
 SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
 Date strDate = sdf.parse(date);
 Long diff=-1;
 int diff=0;
 if (System.currentTimeMillis() > strDate.getTime()) {
    diff=System.currentTimeMillis()-strDate.getTime();
 }
 int remaindays = (int)diff/100/60/60/24
 textview2.setText("You have " +remaindays  +" days to exam");

 String date = "2014-11-12";  
        SimpleDateFormat  format = new SimpleDateFormat("yyyy-MM-dd");  
        try {  
            Date date = format.parse(date);  
            System.out.println(date);  
        } catch (ParseException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
    }

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String currentDateandTime = sdf.format(new Date());

long diff = date2.getTime() - date1.getTime();
int remaindays = (int)diff/100/60/60/24

---

这对您有意义吗？

将字符串日期拆分为“-”，然后创建一个包含年、月和日的新日期。在过帐之前，请搜索StackOverflow的可能重复项。在之前的问答中，您的问题主题已被提及数百次。比如。提示：尝试搜索“joda”（是的，拼写正确）。

 String date = "2014-11-12";  
        SimpleDateFormat  format = new SimpleDateFormat("yyyy-MM-dd");  
        try {  
            Date date = format.parse(date);  
            System.out.println(date);  
        } catch (ParseException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
    }