Check this link:
http://tf.nist.gov/stations/wwvbtimecode.htm
The chart shows the timecode includes:
S, M, D, Y, UT correction, and, LY data.
The logic in the device must reduce the raw data to
month, day etc.

I once wrote a computer program to do this.
For me it was a "non trivial task", but I am not
much of a programer.

Terry