A number of possible superstitious origins for customs associated with Birthday celebrations have been suggested. One source states, that the tradition of birthday parties started in Europe a long time ago. It was feared that evil spirits were particularly attracted to people on their birthdays. To protect them from harm, friends and family would to come be with the birthday person and bring good thoughts and wishes. Giving gifts brought even more good cheer to ward off the evil spirits. This is how birthday parties began. In ancient times, people prayed over the flames of an open fire. They believed that the smoke carried their thoughts up to the gods.
Another reference comments, "The various customs with which people today celebrate their birthdays have a long history. Their origins lie in the realm of magic and religion. The customs of offering congratulations, presenting gifts and celebrating - complete with lighted candles - in ancient times were meant to protect the birthday celebrant from the demons and to ensure his security for the coming year. . . . Down to the fourth century Christianity rejected the birthday celebration as a pagan custom."

वाढदिवस साजरा करण्याबद्दलच्या अंधश्रद्धा
Timezones and birthdays
जयंती
Name days दिवस