Get getLastModifiedTime(path) in TimeUnit.Days

Question

I am trying to get the number of days, after the last modification of a given file.

Following code gives me 18135 when checked for a file which is just been modified.

Code

public class IOExamples {
    public static void main(String[] args) throws IOException {
        Path path = Paths.get("zoo.log"); // zoo.log was just been modified
        System.out.println(Files.getLastModifiedTime(path).to(TimeUnit.DAYS));
    }
}

The output is just a number -

Output

18135

Please help me get the number of days.

You get the number of days since the epoch this way. What you need is to subtract the last modified time from the current time and then express the *difference* in days. — RealSkeptic, Aug 27 '19 at 16:47

NoDataFound · Accepted Answer · 2019-08-27T21:12:34.943

To get the difference between now, you could use:

Duration.between(Files.getLastModifiedTime(path).toInstant(), Instant.now())
        .toDays()
        ;

Note that this may fail if Instant.now() returns a value less than Files.getLastModifiedTime(path).toInstant() which is possible.

See relevant Duration::between javadoc

As per @RealSkeptic comment, you may also use the DAYS enum constant from ChronoUnit:

long days = ChronoUnit.DAYS.between(Files.getLastModifiedTime(path).toInstant(), 
                    Instant.now())
        ;

Note that the warning about failing if Files.getLastModifiedTime(path).toInstant() is greater than Instant.now() does not apply: it will simply return a negative number.

Or just use `DAYS.between`. – RealSkeptic Aug 27 '19 at 17:14 — RealSkeptic, Aug 27 '19 at 17:14

Get getLastModifiedTime(path) in TimeUnit.Days

Code

Output

1 Answers1