Now, what is my Zodiac Sign?

I dont base my future in any medium like zodiac signs,furtune teller and such thing because i really do believe that god is the one who can know on whats gonna happen to us on the near future and we can do all things that we are wanted beside we have this free will to decide and thinks about matter right? well as this new years has been started  a lot of new was been turning out like an new Zodiac sign which called Ophiuchus, dont know behind story about this new zodiac sign so please bear with me, ok ill make some research later as ive done doing this post though..LOL ok let me list out those new set of zodiac sign below

Capricorn: Jan. 20-Feb. 16
Aquarius: Feb. 16-March 11
Pisces: March 11-April 18
Aries: April 18-May 13
Taurus: May 13-June 21
Gemini: June 21-July 20
Cancer: July 20-Aug. 10
Leo: Aug. 10-Sept. 16
Virgo: Sept. 16-Oct. 30
Libra: Oct. 30-Nov. 23
Scorpio: Nov. 23-29
Ophiuchus: Nov. 29-Dec. 17
Sagittarius: Dec. 17-Jan. 20

Actually this topic got my attention then because this was trending on facebook wall i believed, so yeah i better to post it out here..LOL anyways my birthday is December 17 and now im quite bit confused which zodiac signs which i belong too? Ophiuchus: Nov. 29-Dec. 17 or still Sagittarius: Dec. 17-Jan. 20? please could you tell me?LOL ok i think better idea if i have both zodiac because as i got a back luck for being a Ophiuchus i might go for Sagittarius on that day so that the good luck vibes will follow then..i likey this ..LOL ok thats it for now and if i gather more information about this ill definitely update this out..thanks a lot!