Is the birthday flower according to the lunar calendar or solar calendar?

July 25th, Elderberry Flower Language: Enthusiasm

Huabu: You are a warm-hearted person. When you find that friends around you need help and comfort, you will stand up and ask for nothing in return, so you are popular among friends. But you also have a stubborn and uncompromising personality, easily jealous and unstable feelings.

Flower motto: the spirit of giving without asking for anything in return cannot be used in love.