changed date format of photo published date; fixes ibmcnxdev/photosharing-nodejs#111
changed date format of photo published date; fixes ibmcnxdev/photosharing-nodejs#111

vfrancis/photosharing-nodejs,Milstein/photosharing-nodejs,anthonydresser/photosharing-nodejs,dlipeles/photosharing-nodejs,walidkur/photosharing-nodejs