NuGet.PhysicalFileSystem.GetLastModified C# (CSharp) Method

        public virtual DateTimeOffset GetLastModified(string path)
        {
            path = GetFullPath(path);
            if (File.Exists(path))
            {
                return File.GetLastWriteTimeUtc(path);
            }
            return Directory.GetLastWriteTimeUtc(path);
        }