In the very last verse of Caitanya-caritamrita, Krishnadas Kaviraja wrote:
In Vrindavana in the year 1537 Sakabda Era [A.D. 1615], in the month of Jyaistha [May-June], on Sunday, the fifth day of the waning moon, this Caitanya-caritamrita has been completed.
So today is that day!