int64 start_msec, int64 end_msec)
        int64 start_msec, int64 end_msec)
        | start_msec | starting timestamp in number of milliseconds since the Unix Epoch | 
| end_msec | ending timestamp in number of milliseconds since the Unix Epoch | 
| a newly allocated ZeitgeistTimeRange. Free with g_object_unref() |