Why is July 7th birthday on March 3rd?

Qiqi's birthday is March 3rd. On this day, Qiqi will send an email. Qiqi can remember his birthday because he wrote it in his notebook. Although it's a birthday, Qiqi doesn't need longevity noodles, blowing out candles or gifts. Because Qiqi is a zombie, he will not die, but Qiqi is eager to spend his birthday with the protagonist. With the protagonist around, he doesn't need anything else.

July 7th is the most important day for you and me. She is an ordinary person like you and me, and should have lived a life that is not magnificent. However, due to an accident like breaking into Xianjia's cave house by mistake, her life came to an abrupt end at the age when she should have been full of youthful smiles.

But until she died, the stubborn Qiqi still refused to accept her fate. Her obsession with life was so strong that even the gods noticed it, so she was blessed by God. Even this protracted war between the gods and the demons came to an end because both sides were touched by July 7th's "obsession with life".