I do not agree with the content but would certainly agree with the title of the thread.
The sperms have to reach the egg for fertilization within the time frame. It takes the protective layer to fight the acidic environment and need to cover the area within 20-30 minutes as it again liquifies thus freeing the sperm for travelling through the cervix, then reach the entrance to the uterus through the layers of stretchy, clear and thin cervical mucus. After reaching the uterus, the sperm has to propel upward into the fallopian tubes picking up tail-thrashing speed to reach the target within the right time frame. The sperm needs to furrow through the hard outer layer of the egg. Out of the hundreds trying to penetrate the egg's membrane to reach the cytoplasm, only one lucky sperm cell succeeds and thole a chemical reaction that averts other sperm cells from transfixing the egg. Only after this stage does the chromosomes from sperm and egg come together and fertilises.
When you talk about the day of birth, date of birth and time of birth and even place of the birth, it may vary and change as per situation, financial capacity, the residence of the couple, health issues, etc as this cannot be forecasted. Many make their or their children birth Horoscope(Jathagam) i.e. an astrology chart of a person but many do not have it or believe in it so one's progress and defeat cannot be decided on the day of the birth but how you make it to be. Bill gates said, "Being born poor is not your fault, but dying poor is."
“The most important thing in life is to learn how to give out love, and to let it come in." — Morrie Schwartz