🔮 Fortune & Personality

Rokuyō Calendar

A monthly calendar of rokuyō — Japan's six-day cycle of lucky and unlucky days (Senshō, Tomobiki, Senbu, Butsumetsu, Taian, Shakkō). Your input never leaves your browser.

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"M6" in a cell marks the first day of an old-calendar month (a new moon); ʼ marks a leap month.

Upcoming Taian days (popular for weddings & big purchases)

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    Related articles

    Weekend Taian Days Vary by Year — We Counted 2025–2027 Counting only Saturday and Sunday Taian days: 21 in 2026, 11 in 2027. The lunar month reset shifts the cycle. Full weekend-Taian lists for 2025–2027 are included. How Rokuyo (Taian, Butsumetsu) Is Calculated from the Lunar Calendar Japan's rokuyo (Taian, Butsumetsu…) aren't decided by daily divination — they're computed from the lunar calendar. The formula, plus a real 2026 distribution we counted ourselves. Why the Solar Terms Shift Every Year — and the Setsubun That Moved The 24 solar terms track the Sun's position, so their dates drift. A ~60-year distribution of risshun we computed shows why 2021 and 2025 shifted to Feb 3. The Kyureki 2033 Problem — When the Lunar Calendar's Months Become Undefined Under the Tenpo rules, the lunar month names for late 2033–2034 aren't uniquely defined. We show the solstice-priority method Benri.dev uses and how methods diverge.

    Taian and Butsumetsu days in 2026 and 2027, by month

    Rokuyo is not a daily divination: it follows mechanically from the lunar calendar as (month + day) mod 6. Below are the Taian (most auspicious) and Butsumetsu (least) days of 2026 and 2027, by month. The tool above covers any month from 1900 to 2099.

    2026

    MonthTaian (auspicious)Butsumetsu
    Jan1, 7, 13, 24, 306, 12, 18, 23, 29
    Feb5, 11, 21, 274, 10, 16, 20, 26
    Mar5, 11, 17, 22, 284, 10, 16, 21, 27
    Apr3, 9, 15, 19, 252, 8, 14, 18, 24, 30
    May1, 7, 13, 18, 24, 306, 12, 17, 23, 29
    Jun5, 11, 15, 21, 274, 10, 20, 26
    Jul3, 9, 19, 25, 312, 8, 18, 24, 30
    Aug6, 12, 17, 23, 295, 11, 16, 22, 28
    Sep4, 10, 14, 20, 263, 9, 13, 19, 25
    Oct2, 8, 13, 19, 25, 311, 7, 12, 18, 24, 30
    Nov6, 10, 16, 22, 285, 9, 15, 21, 27
    Dec4, 9, 15, 21, 273, 14, 20, 26

    2027

    MonthTaian (auspicious)Butsumetsu
    Jan2, 13, 19, 25, 311, 7, 12, 18, 24, 30
    Feb6, 11, 17, 235, 10, 16, 22, 28
    Mar1, 7, 11, 17, 23, 296, 10, 16, 22, 28
    Apr4, 9, 15, 21, 273, 8, 14, 20, 26
    May3, 7, 13, 19, 25, 312, 6, 12, 18, 24, 30
    Jun5, 11, 17, 23, 2910, 16, 22, 28
    Jul9, 15, 21, 278, 14, 20, 26
    Aug6, 12, 18, 24, 301, 5, 11, 17, 23, 29
    Sep4, 10, 16, 22, 283, 9, 15, 21, 27
    Oct2, 8, 14, 20, 26, 301, 7, 13, 19, 25, 29
    Nov5, 11, 17, 23, 284, 10, 16, 22
    Dec4, 10, 16, 223, 9, 15, 21, 27

    Weekend Taian days in 2026 and 2027

    Taian is the lunar (month + day) mod 6 = 0 day. Wedding planners look for a weekend Taian; here are Saturday and Sunday Taian days in 2026 and 2027. The count changes a lot by year. Use the calendar above for any other month.

    2026

    WeekdayTaian datesCount
    SaturdayJan 24 (Sat), Feb 21 (Sat), Mar 28 (Sat), Apr 25 (Sat), May 30 (Sat), Jun 27 (Sat), Jul 25 (Sat), Aug 29 (Sat), Sep 26 (Sat), Oct 31 (Sat), Nov 28 (Sat)11
    SundayMar 22 (Sun), Apr 19 (Sun), May 24 (Sun), Jun 21 (Sun), Jul 19 (Sun), Aug 23 (Sun), Sep 20 (Sun), Oct 25 (Sun), Nov 22 (Sun), Dec 27 (Sun)10

    2027

    WeekdayTaian datesCount
    SaturdayJan 2 (Sat), Feb 6 (Sat), Jun 5 (Sat), Sep 4 (Sat), Oct 2 (Sat), Oct 30 (Sat), Dec 4 (Sat)7
    SundayJan 31 (Sun), Mar 7 (Sun), Apr 4 (Sun), Nov 28 (Sun)4

    How to use

    Check any date's rokuyō and its old-calendar date, and find upcoming Taian (best-luck) days. Everything runs in your browser.

    Move between months with the Prev / Next buttons — today is outlined. To look up a specific day, use "Check a specific date" and you'll get its rokuyō along with the corresponding date on Japan's old lunisolar calendar. Hunting for a good day for a wedding or a car delivery? The "Upcoming Taian days" list gives you the next best-luck dates at a glance.

    What is rokuyō?

    Rokuyō (六曜) is a six-day cycle of fortune labels that came to Japan from China and spread in the Edo period. Even today, many printed calendars in Japan show it, and it quietly influences real decisions: wedding halls are booked out on Taian days, funerals avoid Tomobiki ("pulling friends along"), and car dealers schedule deliveries around Butsumetsu. The cycle is not tied to the week — it follows the old lunisolar calendar, which is why it seems to "jump" mid-month whenever a new lunar month begins.

    RokuyōKanjiTraditional meaning
    Senshō先勝"First wins." Lucky in the morning, unlucky in the afternoon — good for urgent business.
    Tomobiki友引Lucky morning and evening, unlucky at noon. Funerals are avoided ("pulls friends along").
    Senbu先負"First loses." Unlucky morning, lucky afternoon — a day for keeping calm.
    Butsumetsu仏滅The unluckiest day of the cycle. Weddings tend to avoid it.
    Taian大安"Great peace." Lucky for everything — the most popular day for weddings and moves.
    Shakkō赤口Lucky only around noon. The "red" is associated with fire and blades — be careful.

    Examples

    • Old-calendar New Year's Day is always Senshō; the cycle then runs Tomobiki → Senbu → Butsumetsu → Taian → Shakkō.
    • February 17, 2026 is old-calendar January 1, so it is Senshō.
    • The sequence resets mid-month wherever a new moon starts a new old-calendar month.

    FAQ

    Is my data sent to a server?
    No. All rokuyō and old-calendar computations run in your browser; nothing is transmitted or stored externally.
    How is the rokuyō of a day determined?
    Mechanically, from Japan's old lunisolar calendar: add the old-calendar month and day, and the remainder when divided by 6 picks the rokuyō. New Year's Day on the old calendar is always Senshō, the cycle then advances one step per day, and it resets whenever an old-calendar month begins.
    Does this match printed Japanese calendars?
    The old calendar is computed astronomically from new moons and the sun's position, cross-checked against Japan's National Astronomical Observatory data to within about a minute. For the "2033 problem" (autumn 2033 to 2034), where the old calendar has no single official construction, this tool follows the resolution recommended by Japan's calendar industry — anchoring the month containing the winter solstice as month 11, which gives 2033 a leap 11th month — so calendars built on a different rule may disagree in that window.
    Which years are supported?
    Years 1900–2099. For dates far in the past or future, a day at a boundary could very rarely shift by one due to the nature of astronomical approximation.
    Is there any scientific basis to Taian and Butsumetsu?
    No. Rokuyō is a form of calendar divination with no scientific backing, but it remains a widely observed custom in Japan when choosing dates for weddings, car deliveries and moves.