Thank you Kai, my hosting provider was so kind to setup a PHP 5.3 server. I now have a working feed. Nice stuff. Just a quick remark. My imported posts where assigned to an existing Category “Running” but the post are al Tagged instead of categorised? I will clean my site (Tags and Categories) and try again.
It seems to be related to the PHP version my provider is hosting. The function date_create_from_format is unsupported in 5.2.17. The site below mentions a solution but I am no php coder so it is hard for me to find the correct solution. Is it possible to propose another solution coherent to the solution provided on this site fitting the Runkeeper activity feed plugin?
http://support.advancedcustomfields.com/discussion/2441/solved-date-picker-format-not-working/p1
