檢查兩個日期之間的差異是否超過20分鐘

Question

我有一個日期時間在一個變量previous.Now我想檢查是否以前的日期時間是從目前的時間20分鐘之前。我該怎麼辦呢？

Date previous = myobj.getPreviousDate(); 

Date now = new Date(); 

//check if previous was before 20 minutes from now ie now-previous >=20 

我們該怎麼做？

Answer 1

使用

if (now.getTime() - previous.getTime() >= 20*60*1000) { 
    ... 
} 

或者，更詳細的，但也許稍微容易閱讀：

import static java.util.concurrent.TimeUnit.*; 

... 

long MAX_DURATION = MILLISECONDS.convert(20, MINUTES); 

long duration = now.getTime() - previous.getTime(); 

if (duration >= MAX_DURATION) { 
    ... 
} 

Answer 2

獲取時間以毫秒爲單位，並檢查區別：

long diff = now.getTime() - previous.getTime(); 
if (diff > 20L * 60 * 1000) { 
    // ... 
} 

另一個解決方案可能是使用喬達時間。

Answer 3

你真的應該使用日曆對象，而不是日期：

Calendar previous = Calendar.getInstance(); 
previous.setTime(myobj.getPreviousDate()); 
Calendar now = Calendar.getInstance(); 
long diff = now.getTimeInMillis() - previous.getTimeInMillis(); 
if(diff >= 20 * 60 * 1000) 
{ 
    //at least 20 minutes difference 
} 

Answer 4

使用Joda Time：

boolean result = Minutes.minutesBetween(new DateTime(previous), new DateTime()) 
         .isGreaterThan(Minutes.minutes(20)); 

Answer 5

的Java 8解決方案：

private static boolean isAtleastTwentyMinutesAgo(Date date) { 
    Instant instant = Instant.ofEpochMilli(date.getTime()); 
    Instant twentyMinutesAgo = Instant.now().minus(Duration.ofMinutes(20)); 

    try { 
     return instant.isBefore(twentyMinutesAgo); 
    } catch (IOException e) { 
     throw new IllegalStateException(e); 
    } 
}