  In this note we communicate some important remarks about the concepts of
almost periodic time scales and almost periodic functions on time scales that
are proposed by Wang and Agarwal in their recent papers (Adv. Difference Equ.
(2015) 2015:312; Adv. Difference Equ. (2015) 2015:296; Math. Meth. Appl. Sci.
2015, DOI: 10.1002/mma.3590).
