an anniversary of the day on which a person was born (or the celebration of it)
उस दिन की एक वर्षगांठ जिस पर एक व्यक्ति का जन्म हुआ (या इसका उत्सव)
the date on which a person was born
जिस तारीख पर एक व्यक्ति का जन्म हुआ था