將日期字符串轉換成毫秒的java

Question

可能重複：
Calculate date/time difference in java

如何將一個將來的日期，如星期六2012年2月17日在java中被轉換成毫秒然後可以從當前時間中減去毫秒以產生直到該未來日期的剩餘時間。

Answer 1

最簡單的方法是使用DateFormat：

String input = "Sat Feb 17 2012"; 
Date date = new SimpleDateFormat("EEE MMM dd yyyy", Locale.ENGLISH).parse(input); 
long milliseconds = date.getTime(); 
long millisecondsFromNow = milliseconds - (new Date()).getTime(); 
Toast.makeText(this, "Milliseconds to future date="+millisecondsFromNow, Toast.LENGTH_SHORT).show(); 

更困難的技術（即基本上沒有什麼DateFormat爲你做）涉及自己進行解析（這將不是被認爲是最佳實踐）：

String input = "Sat Feb 17 2012"; 
String[] myDate = input.split("\\s+"); 
int year = Integer.parseInt(myDate[3]); 
String monthString = myDate[1]; 
int mo = monthString.equals("Jan")? Calendar.JANUARY : 
      monthString.equals("Feb")? Calendar.FEBRUARY : 
      monthString.equals("Mar")? Calendar.MARCH : 
      monthString.equals("Apr")? Calendar.APRIL : 
      monthString.equals("May")? Calendar.MAY : 
      monthString.equals("Jun")? Calendar.JUNE : 
      monthString.equals("Jul")? Calendar.JULY : 
      monthString.equals("Aug")? Calendar.AUGUST : 
      monthString.equals("Sep")? Calendar.SEPTEMBER : 
      monthString.equals("Oct")? Calendar.OCTOBER : 
      monthString.equals("Nov")? Calendar.NOVEMBER : 
      monthString.equals("Dec")? Calendar.DECEMBER : 0; 
int day = Integer.parseInt(myDate[2]); 
Calendar c = Calendar.getInstance(); 
c.set(year, mo, day); 
long then = c.getTimeInMillis(); 
Time current_time = new Time(); 
current_time.setToNow(); 
long now = current_time.toMillis(false); 
long future = then - now; 
Date d = new Date(future); 
//TODO use d as you need. 
Toast.makeText(this, "Milliseconds to future date="+future, Toast.LENGTH_SHORT).show(); 

Answer 2

Firts，你必須解析你的字符串才能得到它的日期表示。 Here是示例和一些文檔。 然後你應該打電話給你的日期的getTime（）方法。

Answer 3

通行證年，月，在這段代碼和變量DIFF日期會給毫秒的時間，直到該日期以後日期的當天，

Date date = new GregorianCalendar(year, month, day).getTime(); 
    Date today = new Date(); 
    long diff = date.getTime() - today.getTime(); 

Answer 4

DateFormat format = new SimpleDateFormat("EEE MMM dd yyyy", Locale.US); 
long futureTime = 0; 
try { 
    Date date = format.parse("Sat Feb 17 2012"); 
    futureTime = date.getTime(); 
} catch (ParseException e) { 
    Log.e("log", e.getMessage(), e); 
} 

long curTime = System.currentTimeMillis(); 
long diff = futureTime - curTime; 

Answer 5

您可以直接調用的getTime（）日期對象的方法。請通過樣品按照以下

import java.util.Date; 

public class Test { 
    @SuppressWarnings("deprecation") 
    public static void main(String[] args) { 

     System.out.println(new Date("Sat Feb 17 2012").getTime()); 

    } 

} 

Answer 6

try { String str_date="11-June-07"; 
    SimpleDateFormat formatter ; 
    Date date ; 
    formatter = new SimpleDateFormat("dd-MMM-yy"); 
    date = (Date) formatter.parse(str_date); 
    Log.i("test",""+date); 
    } catch (Exception e) 
    {System.out.println("Exception :"+e); } 

    Date d = new Date(); 
    long time = d.getTime(); 
    long timeDiff = time - lastTime; 

//timeDiff will contain your value. 
//import these two, 
//import java.text.SimpleDateFormat; 
//import java.util.Date;