Yanthy learned the days of the week at around the same time he was learning phonics. As usual, he learned the days of the week, their correct sequence and how to read them through a song video. I found this song video in YouTube when he was around two years old. He still likes to sing this song sometimes (now that he is three years old) even though he can already enumerate the days of the week without singing the song.
Below is the video. Check it out and see if your child will like it too.
I reinforced this lesson by showing him the days of the week in our calendar and in the devotional I use for my prayer time wherein the days are also printed.