Giyu Tomioka is born on February 8, during the Taisho era. This makes him 15, turning him 16. He's an Aquarius and his Chinese zodiac is the Rooster. This is after parents' death and before his sister, Tsutako Tomioka sacrificed her life for him a day before her wedding. This is when he used to be much different compared to how he is as a Hashira. This is before he was a demon slayer. This takes place early in the year.