Hello, John and Doves,
 

17 December 2014 [25 Kislev from the evening before] to 28 September 2015 [15 Tishrei from the evening before] = 285 days, excluding the endpoint and including the beginning day.

 

This is at the upper extreme of the length of human gestation.  The lower extreme for a fully formed newborn human baby is 250 days.

 

According to bethlehemstar.net, Yeshua HaMashiach was conceived by the Holy Spirit in the Virgin Mary’s womb on the first day of Hanukkah.

 

Then Yeshua would have been born on Sukkot in the following year.

 

~Blessings,

Mike C.