A Japanese Phrase for Asking About Someone's Birthday: "お誕生日はいつですか？"

"お誕生日はいつですか？" means "When is your birthday?" and it's the basic Japanese expression used to ask someone when their birthday is. It's a handy conversation starter. To answer, you can say something like "5月です。" (It's in May). To wish someone well, say "お誕生日おめでとうございます！" (Happy birthday!).