如何检查2个日期之间的差异是否超过20分钟

Question

我在变量previous 中有一个日期时间。现在我想检查以前的日期时间是否比当前时间早二十分钟。

Date previous = myobj.getPreviousDate();

Date now = new Date();

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

我们该怎么做？

Answer 1

使用

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

或者，更冗长，但可能更容易阅读：

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 Time：

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

Answer 3

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);
    }
}

Answer 4

你真的应该使用 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 5

以毫秒为单位获取时间，并检查差异：

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

另一种解决方案可能是使用 Joda 时间。