https://bugs.openjdk.java.net/browse/JDK-8180767
http://cr.openjdk.java.net/~bpb/8180767/webrev.00/

java.io.File#lastModified() returns zero if the file in question does not 
exist. If however the file does exist and by some fantastic improbability has a 
last-modified time equal to the epoch, then a caller literally following the 
specification verbiage would interpret the returned value of zero as signifying 
that the file does not exist. It would probably be ideal to throw a 
FileNotFoundException when the file does not exist, but instead here we propose 
to return unity (1) instead of zero when the last-modified time of the file 
equals the epoch.

Note that this webrev is with respect to the one for [1] which is currently 
pending CCC approval, and is shown in the webrev in the JDK 9 tree. As it 
contains code changes, it would however be pushed to JDK 10 after the patch for 
[1] has been pushed and eventually migrated into the JDK 10 repository.

Thanks,

Brian

[1] http://mail.openjdk.java.net/pipermail/core-libs-dev/2017-May/047787.html

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