What Is Rokuyo? Japan's Six-Day Calendar of Lucky Dates

Japanese believe certain calendar days naturally attract good or bad fortune. Rokuyo is a repeating six-day cycle that assigns a distinct level of luck to every single day.

While contemporary life runs on the solar calendar, millions in Japan still glance at these traditional markings when scheduling weddings, house moves, or funerals.

Where did Rokuyo come from?

According to tradition, the divination concept originated in China and arrived in Japan between the late Kamakura and Muromachi periods.

It evolved across centuries and gained widespread popularity on mass-printed calendars during the nineteenth century.

Although some day names include religious terms, the system is a folk astrological calendar rather than an official tenet of Shinto or Buddhism.

Government bodies avoid using it on official paperwork, yet commercial planners across Japan still print Rokuyo notes beside standard dates.

How is Rokuyo counted?

Rokuyo is calculated from the traditional lunar calendar rather than the Gregorian solar calendar.

Each day's designation stems from a formula: add the lunar month number to the lunar day number, then divide by six.

Because the cycle resets on the first day of every lunar month, the sequence does not always run unbroken on modern calendars.

• Month 1 and Month 7 begin on Sensho
• Month 2 and Month 8 begin on Tomobiki
• Month 3 and Month 9 begin on Sakimake
• Month 4 and Month 10 begin on Butsumetsu
• Month 5 and Month 11 begin on Taian
• Month 6 and Month 12 begin on Shakku

What do the six days mean?

Every day in the six-step sequence carries its own timing advice.

Sensho (First Win)

Morning holds good fortune, while the afternoon is unfavorable. It rewards acting quickly and handling urgent matters early.

Tomobiki (Pulling Friends)

Luck is shared, making it popular for weddings. Superstition advises avoiding funerals here so sorrow does not draw friends into misfortune.

Sakimake (First Lose)

Starting early or rushing invites trouble, but the afternoon turns calm and favorable. It suits low-stress tasks and peaceful rest.

Butsumetsu (Buddha's Demise)

Known as the most inauspicious label in the cycle. Celebrations and brand-new beginnings are traditionally postponed.

Taian (Great Peace)

The undisputed most auspicious day in Rokuyo. Everything attempted on this date is thought to meet success without failure.

Shakku (Red Mouth)

A difficult day associated with fire and blades, leaving celebratory events unwelcome. Only the midday window between 11 a.m. and 1 p.m. is favorable.

How seriously do people take it today?

Daily life in Japan does not stop for unlucky labels, and younger generations often dismiss the cycle as harmless folklore.

Yet milestone events still feel its weight. Wedding halls fill up rapidly on Taian and often discount venue fees on Butsumetsu.

Many municipal crematoriums routinely close on Tomobiki days because families refuse to hold memorial services then.

Groundbreaking ceremonies, real estate contracts, and hospital discharges continue to track the cycle for peace of mind.

Check yours

You can easily apply Rokuyo awareness to your own milestone planning:

• Look up your target date in a Japanese lunar almanac or online Rokuyo calendar converter.
• Select Taian if you are scheduling a wedding, registration, or business launch.
• Use Sensho for morning appointments or Sakimake if your key moment happens in the afternoon.
• Reserve Butsumetsu for quiet reflection, study, or low-stakes errands rather than major contracts.