Is the constellation based on the expected date of birth or the date of birth?

Constellations are divided according to the birthdays of the solar calendar (new calendar, Gregorian calendar) on the day of birth.

The following are twelve constellations for your reference.

What is the date of birth of the constellation?

Aries 03/265438

Taurus 04/20-05/20

Gemini 05/2 1-06/20

Cancer 06/2 17/22

Leo 07/23-08/22

Virgo 08/23-09/22

Libra 09/23- 10/22

Scorpio? 10/23- 1 1/2 1

Sagittarius11/22-12/21

Capricorn12/22-0119

Aquarius 0 1/20-02/ 18

Pisces 02/65438