Get the last-modified time of the file.
Returns a Future<DateTime>
that completes with the date and time when the file was last modified, if the information is available.
Throws a FileSystemException if the operation fails.
Future<DateTime> lastModified();
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-io/File/lastModified.html