YukaYou’ve probably seen both 月曜日 and 月曜 in Japanese — but is there actually a difference? Let’s find out!
| Word | Reading | Meaning |
|---|---|---|
| 月曜日 | getsuyoubi | Monday (full, standard form) |
| 月曜 | getsuyou | Monday (abbreviated, common in speech and writing) |
月曜日: The Full Form
月曜日 (getsuyoubi) is the complete word for Monday. The 日 (bi/nichi) at the end means “day.” You’ll find this form in textbooks, formal writing, and when precision matters:
- 月曜日に会議があります。 — There’s a meeting on Monday.
- 月曜日から金曜日まで働く。 — I work from Monday to Friday.
- 次の月曜日はお休みです。 — Next Monday is a holiday.
月曜: The Short Form
月曜 (getsuyou) drops the 日 but means exactly the same thing. It’s extremely common in everyday speech, texting, schedules, and casual writing:
- 月曜、暇？ — Are you free on Monday? (casual text)
- 月曜から始めよう。 — Let’s start from Monday.
- 月曜の朝は辛い。 — Monday mornings are tough.
The full pattern applies to all days of the week:
| Full form | Short form | Day |
|---|---|---|
| 月曜日 (getsuyoubi) | 月曜 (getsuyou) | Monday |
| 火曜日 (kayoubi) | 火曜 (kayou) | Tuesday |
| 水曜日 (suiyoubi) | 水曜 (suiyou) | Wednesday |
| 木曜日 (mokuyoubi) | 木曜 (mokuyou) | Thursday |
| 金曜日 (kin’youbi) | 金曜 (kin’you) | Friday |
| 土曜日 (doyoubi) | 土曜 (doyou) | Saturday |
| 日曜日 (nichiyoubi) | 日曜 (nichiyou) | Sunday |
ReiWhich form should I use when learning?
YukaLearn 月曜日 first — it’s the standard form you’ll see in textbooks. But in real life, 月曜 is just as natural, so get comfortable with both!
ReiAre there any situations where I must use the full 〜日 form?
YukaFormal documents, official announcements, and careful speech tend to use the full form. In casual conversation and messages, the short form is perfectly fine.
Common Mistakes
Mistake: Writing 月曜 in a formal letter or official form when 月曜日 is expected. When in doubt, use the full 〜日 form for written documents.
Also note: The reading of 日 changes. In the day names it’s び (bi): 月曜び. Don’t confuse it with 日 read as にち (nichi) in other contexts.
Quick Quiz
Q1: Fill in: “I have a dentist appointment on Wednesday.”
Answer: 水曜日に歯医者の予約があります。
—
Q2: Your friend texts: “Are you free this Friday?” Reply casually.
Answer: 今週の金曜、空いてるよ！
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