Maybe this page will provide some hints into the Post method or updating 
the properties even though it's for uploading an album:

http://nullege.com/codes/show/src@o@h@oh-mainline-HEAD@vendor@packages@gdata@src@gdata@[email protected]/352/gdata.photos.Timestamp.

On Wednesday, April 22, 2015 at 5:36:34 PM UTC-7, Robert Gelb wrote:
>
> Code below in c# and I am trying to update the timestamp of the photo
>
> ulong timestamp = 
> Convert.ToUInt64(picasaEntry.GetPhotoExtensionValue("timestamp"));
>
> // deduct 9 hours
> DateTime dt = FromUnixTime(pa.Timestamp).AddHours(-9);
> picasaEntry.SetPhotoExtensionValue("timestamp", 
> Convert.ToString(ToUnixTime(dt)));
>                     
> var updatedEntry = (PicasaEntry) picasaEntry.Update();
>
> I then check the updated piece and nothing is updated.
> Am I missing something simple?
>

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