Rokuyo: Japan's Six-Day Lucky Calendar

Printed in tiny characters on many Japanese calendars, a six-day cycle quietly guides weddings, funerals, openings and even moving dates.

Published October 18, 2026 at 11:51 PM JST | By Tokyo Paul

Quick answer: Rokuyo is a six-day cycle of lucky and unlucky labels printed on many Japanese calendars: senshō, tomobiki, senbu, butsumetsu, taian and shakku. Taian is considered the most auspicious day, and butsumetsu the least. People often check rokuyo when picking dates for weddings, funerals, business openings and other important events.

The six names in order

Rokuyo consists of six labels that repeat in a set order: senshō, tomobiki, senbu, butsumetsu, taian and shakku. On calendars you will often see them written in kanji, sometimes with small reading guides, in a corner of each date box. Smartphone calendars and wall calendars from shrines or banks often include them by default. Each label carries a general meaning. Senshō is read as win early, and tradition says that morning is favorable.

Tomobiki is often explained as pulling a friend, a day when luck can spread to others. Senbu means lose early, so the afternoon is favored. Butsumetsu is the day of the Buddha's passing, regarded as unlucky. Taian means great peace and is the most auspicious, while shakku is a day when only the midday hours are considered safe. These are cultural customs, not religious rules. Many people treat them lightly, and others follow them carefully, especially for family events.

How the cycle is calculated

Unlike a simple repeating rotation of six, rokuyo is tied to the old lunar calendar. The label for the first day of each lunar month is fixed, and the cycle then continues in order through that month. At the start of the next lunar month, it resets to a different label according to the month. Because the traditional lunar months do not line up exactly with modern calendar months, the pattern can seem irregular. A sequence might skip back after only a few days, which is normal.

A printed calendar or app is the easiest way to read it, and there is no need to calculate it yourself. If you ever wonder why two neighboring months seem to start on different labels, this lunar link is the reason, and it is also why the same label can appear two days in a row at a month boundary. The system arrived from China in medieval times and went through several changes in Japan. It became widely popular in the Edo period and again later in the twentieth century, when calendar printers began including it for convenience.

Taian and the wedding calendar

Taian is the day most people search for when planning a wedding. Many couples try to hold the ceremony or reception on a taian, and wedding halls often see higher demand on those dates. Taian that falls on a weekend can be especially popular, so bookings are made early. Because butsumetsu is considered the least favorable, some venues offer discounts or special plans for weddings on these days.

For couples who do not mind the superstition, this can be a practical way to hold a celebration at a lower price. Ask the venue about seasonal offers and details. For guests, a convenient date often matters more than the label. Other events follow similar thinking. Companies sometimes choose taian for grand openings, and families may select it for moving house, engagement ceremonies or the delivery of a new car. People who are not superstitious may still choose it because relatives appreciate the gesture.

Funerals and the tomobiki rule

Tomobiki has a specific, widely known association. Because the name can be read as pulling a friend, many people avoid holding funerals on that day, out of concern that another loss might follow. In practice, some crematoriums in Japan close on tomobiki days, so funeral schedules take the calendar into account. This is a case where the custom has a real practical effect.

If you are in Japan and are helping a friend or colleague with arrangements, it is polite to follow their guidance and avoid questioning the schedule. For celebrations, however, tomobiki is considered pleasant, since the idea of drawing friends along fits happy occasions. Some people choose it for weddings or parties for that reason. The flexible meaning shows how a single label can be read in different ways depending on the event.

Shakku, senshō and senbu in practice

Shakku is the label that most often confuses newcomers. It is usually described as an unlucky day, except for a short window around noon, from roughly 11 a.m. to 1 p.m., when luck is said to be present. The name literally means red mouth, and in older almanac beliefs red was linked with fire, knives and other hazards. Senshō is the day when speed is rewarded, so people may schedule morning tasks, such as signing paperwork or making announcements. Senbu is the reverse, with the afternoon considered better.

The details differ slightly between sources, so rely on your calendar or the person you are working with. If you find yourself juggling schedule options, a common approach is to pick the date that suits everyone first, and then see whether rokuyo creates a conflict. Most Japanese people treat it as a bonus consideration, not a strict requirement. A date that is convenient for guests, affordable for the venue and also a good rokuyo day is simply a pleasant coincidence.

Where you will see rokuyo

Rokuyo appears on daily tear-off calendars, paper wall calendars, and in the calendar sections of weekly magazines and newspapers. It is also shown in some apps and websites, and shrines often print it on their own calendars. In real estate and moving, companies sometimes mention taian when scheduling. In business, a contract signing might be set on a favorable day if both parties agree.

Weddings, funerals and ceremonies at shrines and temples are the settings in which the labels carry the most weight. For visitors, noticing the labels adds a small layer of understanding when you look at a Japanese calendar. If you get invited to a wedding or ceremony, the date probably reflects a mix of practical and traditional thinking. Gift shops attached to shrines frequently sell calendars that print the day labels in a clear, easy-to-read style.

How to use rokuyo respectfully

If you live in Japan or work with Japanese colleagues, a simple rule is to check rokuyo only when it matters to the other person. Asking whether a date is lucky is a friendly question, and the answer often comes with a smile. Never dismiss the custom if someone clearly values it. For events you plan yourself, consider the preferences of older relatives or partners.

Some families care a lot, others not at all. A taian date may be an easy way to make a family member happy at little cost. If you want to learn more, calendar shops and bookstores carry guides to traditional almanacs. Online conversion tools show rokuyo for any date in the year, and you can check them before sending invitations.

Frequently Asked Questions

Which rokuyo day is the luckiest?

Taian is regarded as the luckiest day and is popular for weddings, grand openings and other celebrations. Its name means great peace. Many calendars highlight it in a special color or mark, and wedding halls often see their highest demand on taian weekends, so couples tend to book early.

Which rokuyo day is unlucky?

Butsumetsu is traditionally considered the least auspicious day, and some wedding venues offer discounts for it. Tomobiki is avoided for funerals, and shakku is regarded as unlucky except around midday. These are folk customs, and many people treat them lightly or ignore them altogether.

Is rokuyo a Buddhist teaching?

No. Although the name butsumetsu includes a Buddhist term, rokuyo is not an official Buddhist teaching. It is a folk calendar custom that came from China and developed in Japan over centuries. Many temples do not endorse it, though some families still follow it for ceremonies.

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More guides from Tokyo Paul: Japanese Shinto Weddings: What Happens in the Ceremony, Kanreki: The 60th Birthday Celebration and Nijushi Sekki: Japan's 24 Solar Terms.