https://nodejs.org/api/fs.html#fs_class_fs_stats
var ts = fs.statSync(file).mtime.getTime()
- atime - last access time (open by you or script)
- mtime - last modification to the file
- ctime - last modified metadata (chmod etc)
https://nodejs.org/api/fs.html#fs_class_fs_stats
var ts = fs.statSync(file).mtime.getTime()