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My friend stumbled upon an error in https://github.com/dajobe/flickcurl/blob/master/src/photos-api.c#L1998. The date_taken parameter is converted to sql timestamp, but it is not passed to parameters and therefore not sent to Flickr.
I can not currently test it nor provide a pull request, but the correction should be simple and straightforward, on line 2033 add something like
Oops! Yes that is a silly error. I'll fix it
Fixed in edf1273