Day 1 of the 7th month of the Biblical Hebrew year 6026 starts at:
sunset on the 14th through sunset on the 15th of the Gregorian month.

Exodus 23:12
For six days do your work, and on the seventh day keep the Sabbath; so that your ox and your donkey may have rest, together with the son of your servant and the man from a strange land living among you.