#Instant minus minutes java example how to

('instant1 is not after instant2') īoolean isBefore = instant1.isBefore(instant2) ('instant1 & instant2 are not same') īoolean isAfter = instant1.isAfter(instant2) Return Value an Instant based on this instant with the specified nanoseconds subtracted, not null. public Instant minusNanos (long nanosToSubtract) Parameters nanosToSubtract the nanoseconds to subtract, positive or negative. comparing two instants using equals() methodīoolean isEquals = instant1.equals(instant2) Following is the declaration for (long nanosToSubtract) method. ('Update file's last modified failed.') īesides, If you want modify a timestamp, just use +/- operations.Īnd you can convert timestamp to LocalDateTime, and use LocalDateTime's api to modify time easily.Package .instant LocalDateTime.ofInstant(Instant.ofEpochMilli(file.lastModified()), ZoneId.systemDefault()))

('File's last modified in LocalDateTime: ' + ('File's last modified in millisecond: ' + file.lastModified()) ('Update file's last modified successfully.')

('File's last modified in LocalDateTime: ' + localDateTime) īoolean isModified = tLastModified(timestamp) LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp), ZoneId.systemDefault()) print time for human, convert to LocalDateTime ('File's last modified in millisecond: ' + timestamp) get file's last modified, in millisecond Private static final long ONE_MINUTE = 60L * ONE_SECOND Private static final long ONE_SECOND = 1000L I guess you want to modify a file's last modified time. So I edit my codes, remove the legacy classes.

#Instant minus minutes java example how to

Link: Oracle tutorial: Date Time explaining how to use java.time. That class was poorly designed and is long outdated. The minus method of an Instant subtracts a Duration, an amount of time, and returns a new Instant object.ĭon’t use Calendar.

In order to do our time math I first convert it to an Instant, which is a central class of java.time. NIO gives us a FileTime in this case denoting the time the file was last modified. I am using the modern Java NIO API and java.time, the modern Java date and time API. Instant::toString (implicitly called when appending the Instant to a string) always generates a string in UTC. Running just now on my computer I got this output: ('Time after subtraction is ' + timeBeforeLastModified) Instant timeBeforeLastModified = lastModifiedInstant.minus(timeToSubtract) Instant lastModifiedInstant = lastModified.toInstant() NIO and java.time Path filePath = Paths.get('myFile.txt') ĭuration timeToSubtract = Duration.ofMinutes(7) įileTime lastModified = Files.getLastModifiedTime(filePath)