A Hindi Phrase for Asking About Someone's Birthday: "आपका जन्मदिन कब है?"

"आपका जन्मदिन कब है?" means "When is your birthday?" and it's the basic Hindi expression used to ask someone when their birthday is. It's a handy conversation starter. To answer, you can say something like "मेरा जन्मदिन मई में है।" (My birthday is in May). To wish someone well, say "जन्मदिन मुबारक हो!" (Happy birthday!).