Thanks Sharon Whitcombe:
“Scripturally, John the Baptist was born six months before Jesus (Luke 1:26-38). John’s father, Zechariah, served in the temple with the 8th division (‘division of Abijah’) just before John was conceived(Luke 1:5, 8-25, 1 Chronicles 24:7-18), meaning John was born in late March 2BCE .
Six months later, Jesus was born Sept-Oct, 2BCE.
**Another way to figure scripturally is this: Jesus was 30 when he started his ministry (Luke 3:23). He preached for three and a half years, and died at Passover around April, A.D. 33. Count back six months, and it brings you to his birth month of Sept/October.”