如何检查2个日期之间的差异是否超过20分钟

Question

I have a datetime in a variable previous . Now i want to check if the previous datetime is more than twenty minutes before the current time.

Date previous = myobj.getPreviousDate();

Date now = new Date();

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

How can we do it?

Answer 1

Use

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

Or, more verbose, but perhaps slightly easier to read:

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

Using Joda Time :

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

Answer 3

You should really use Calendar object instead of 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 solution:

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 5

Get the times in milliseconds, and check the difference:

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

Another solution could be to use Joda time.