Japanese Dates & Days of the Week — 29 Essential Words for Months, Dates, and Scheduling (2026)

Dates in Japanese — Logical But With Tricky Exceptions

Japanese dates follow a logical system: months are simply numbers plus 月 (gatsu), so January is 1月 (ichigatsu), February is 2月 (nigatsu), and so on. Days of the week use nature-themed kanji — moon, fire, water, tree, gold, earth, sun — which makes them memorable once you learn the pattern.

The tricky part is the dates themselves. Days 1–10 use irregular native Japanese readings (tsuitachi, futsuka, mikka…) rather than the regular number + 日 pattern. These are high-frequency and genuinely need memorization. This deck covers all three systems so you can read schedules, book reservations, and follow conversations about time.

Months of the Year

Months are straightforward: number + 月 (gatsu). Each example below includes a Japanese cultural event or seasonal note to help the month stick in memory.

Dates 1st–10th

Days 1–10 use special native Japanese readings — these are the ones to memorize carefully. From the 11th onward, the pattern becomes regular (11日 = juuichinichi, 20日 = hatsuka is another exception, then 21日 = nijuuichinichi, etc.).

Days of the Week

Each day of the week is built from a kanji representing a natural element plus 曜日 (youbi — day of the week). The pattern: 月(moon)→火(fire)→水(water)→木(tree)→金(gold)→土(earth)→日(sun). Learn the 7 kanji and you have all 7 days.

Tips for Dates & Days in Japanese

1. The days of the week kanji tell a story

The seven kanji used for days of the week — 月火水木金土日 — come from classical East Asian cosmology: moon, fire, water, wood, metal, earth, sun. They map onto the same planetary associations as Western weekdays (Monday = moon, Tuesday = Mars/fire, etc.). This cross-cultural connection makes them easier to memorize. In writing, they're often abbreviated to just the first kanji: 月・火・水・木・金・土・日.

2. The irregular date readings follow a logic

The irregular 1st–10th readings (tsuitachi, futsuka, mikka…) come from ancient native Japanese number words. A useful mnemonic: futsuka (2nd) sounds like "futatsu" (two things), mikka (3rd) like "mittsu" (three things), yokka (4th) like "yottsu," and so on. The connection to the old counting system helps bridge the gap. The 14th (juuyokka) and 24th (nijuuyokka) also use the irregular reading — watch for those.

3. Japanese date order is year → month → day

Japanese dates are written largest to smallest: year first, then month, then day. 2026年5月19日 is May 19th, 2026. This is the opposite of American format (5/19/2026) and matches ISO standard (2026-05-19). When filling out forms or reading official documents in Japan, always check for this order. 年 (nen/toshi) = year, 月 (gatsu/tsuki) = month, 日 (nichi/ka) = day.

4. Golden Week and Obon are the two times not to travel

Japan has two major travel rush periods: ゴールデンウィーク in late April–early May (5月), when several national holidays cluster together, and お盆 in mid-August (8月), when many Japanese travel home to their hometowns. Trains, flights, and hotels book up weeks in advance and prices spike. If your trip dates overlap with either, book accommodation and transport as early as possible.

Frequently Asked Questions

How do I say "What day is today?" in Japanese?

今日は何曜日ですか？ (Kyou wa nanyoubi desu ka?) — What day of the week is today? For the date: 今日は何日ですか？ (Kyou wa nannichi desu ka?) — What is today's date? And for the full date including month: 今日は何月何日ですか？ (Kyou wa nangatsu nannichi desu ka?).

How do I say a full date in Japanese?

Combine year + 年, month + 月, day + 日 in that order. For example, May 19th, 2026 is 2026年5月19日 — read as nisen nijuuroku nen gogatsu juukunichi. In speech, the year is often omitted if it's obvious from context: 5月19日 (gogatsu juukunichi). For reservations and official communication, always include the year.

Are there irregular readings beyond the 1st–10th?

Yes — the 14th is 14日 (juuyokka), the 20th is 20日 (hatsuka), and the 24th is 24日 (nijuuyokka). All other dates from 11th onward follow the regular pattern: number + nichi (e.g., 11日 = juuichinichi, 25日 = nijuugonichi). Memorize those three exceptions alongside the 1st–10th and you're covered.

What is the Japanese calendar era system?

Japan uses two date systems simultaneously: the Western year (西暦, seireki) and the Imperial era year (元号, gengou). The current era is 令和 (Reiwa), which began in May 2019 when Emperor Naruhito ascended. 2026 is 令和8年. Official documents, newspapers, and many forms use the era year. The Western year is also widely understood and accepted — for most practical purposes, using it is fine.

Master Japanese Dates — Study These Words First

All 29 dates, months, and days above are available as a ready-made deck in Onigiri Anki. The irregular date readings especially benefit from audio practice — hearing tsuitachi, futsuka, mikka repeatedly is the fastest way to lock them in.

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