John and Doves,
 
I'm sure someone else will be able to tell us about the date but I can say that 777 = 37 x 21. Or, if you like 37 x (7+7+7) or, 37 x 7 x 3.
 
37 is a remarkable number standing for the WORD OF GOD and is said to be the most sublime of all numbers (FC Payne).
 
Greek gematria for Godhead(Theotes) = 592   37 x 8 x 2.
    "        "        "    Jesus                   = 888   37 x 8x 3.
    "        "        "    Christ                   = 1480 37 x 8 x 5.
    "        "        "    Son of Man           = 2960 37 x 8 x 10
 
7 is God's seal of complete perfection.
 
3 points to what is real, essential, perfect, substantial, complete, and Divine. It also speaks of the Godhead (Bullinger).
 
All of this sounds very special to me.
 
Blessings,
 
Phil.