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I am developing a website where the users can log in with their Facebook credentials.
Now I am facing an issue with Date and Times. My local system uses the “Romance Standard Time” which is different to what Facebook uses.
Where I am locally we use DST and depending on the time of the year we can either be at UTC + 1 or UTC + 2.
My question is, “How can I translate the Facebook times into the format my local system will use, taking into account the occasional change between UTC+1 and UTC+2?”
Per this documentation, the only way for a user to change their timezone is to change their computer’s timezone and log out and back in to Facebook. This would lead me to believe that they are simply taking the offset from UTC in JavaScript in the browser and passing it back to the server.
So the value of the
timezonefield coming back from the Facebook Graph API is probably the offset as of the last time the user logged in.It’s also possible it represents the offset as of the date the user signed up, and that it can’t change. I couldn’t find any reference in the documentation, so one would have to experiment to be sure.
At either rate, one can’t derive the time zone from the offset alone. There are many time zones that have the same offset. For a useful analogy, see my answer on a related subject here.