System.IO.FileSystem.GetLastWriteTime C# (CSharp) Метод

        public abstract DateTimeOffset GetLastWriteTime(string fullPath);
        public abstract void SetLastWriteTime(string fullPath, DateTimeOffset time, bool asDirectory);

 public static DateTime GetLastWriteTimeUtc(string path)
 => FileSystem.GetLastWriteTime(Path.GetFullPath(path)).UtcDateTime;