In Japanese, "When is your birthday?" is 誕生日はいつですか？ (tanjōbi wa itsu desu ka ？). It is a phrase.
Listen to the pronunciation:
誕生日はいつですか？ is written in kanji and hiragana. Romanised as tanjōbi wa itsu desu ka ？, it sounds roughly like "tah-n-joh-bee wah ee-tsoo deh-soo kah ？" to an English ear.
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Buy on Steam誕生日はいつですか？ is romanised as tanjōbi wa itsu desu ka ？. Say it roughly like "tah-n-joh-bee wah ee-tsoo deh-soo kah ？" in English. Each Japanese syllable has even weight, so keep the rhythm steady.
誕生日はいつですか？ is a neutral, everyday word that works in both casual and polite speech. The level of formality comes from the sentence structure around it, not from the word itself.
誕生日はいつですか？ is written using kanji and hiragana. Kanji characters carry the core meaning; any hiragana or katakana that follow show grammatical endings.
This word is part of the vocabulary taught in the Japanese language learning game Noun Town, where words are introduced through play rather than memorisation.
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