Sentence:  WMGI's new format, of which I heard a mere 20 minutes last night around 8, seemed to be brighter and much more uptempo. I imagine they've got the youngest stuff (i.e., the rap) <WSD>dayparted</WSD> into evenings only, and are being much less adventurous mornings. 
Meaning of the word marked with <WSD> tags:  To assign (material) to such a period.