Chabad Rabbi agrees May 21st is the end:

Its the end of the week, Shabbat!

The entire Jewish world on this Shabbat reads the ending portion of Leviticus, Shabbat Chazak!!

Let's pray that this Shabbat is the real ending we all are awaiting; the end of this exile with the coming of Moshiach, the end of war, jealousy , illness and death; a blessing for the entire world!!