检查2日期之间的差异是否超过20分钟

Question

我在一个变量之前有一个日期时间.现在我想检查之前的日期时间是否在当前时间的二十分钟之前.我该怎么做？

Date previous = myobj.getPreviousDate();

Date now = new Date();

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

我们怎么做？

Answer 1

使用

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

或者,更详细,但也许更容易阅读:

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

使用Joda时间:

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

Answer 3

您应该使用Calendar对象而不是Date:

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

Java 8解决方案：

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);
    }
}