Japan Business Day Calculator
Calculate eigyobi in Japan with the 16 statutory kokumin no shukujitsu preselected, including Happy Monday shifts, furikae kyujitsu substitute days, and Citizens' Holiday for sandwiched weekdays. Use it for kessan close timing, Bank of Japan settlement windows, fiscal-year-end reporting at 31 March, Tokyo Stock Exchange filing windows, and any clause measured in Japanese business days.
How Japanese business days are defined
Eigyobi in Japan are Monday through Friday, excluding the kokumin no shukujitsu set by the Cabinet Office under the National Holidays Act. Three rules add days to the basic 16-holiday list. Happy Monday locks four holidays to specific Mondays, namely Coming of Age Day, Marine Day, Respect for the Aged Day, and Sports Day, so they always produce a three-day weekend. Furikae kyujitsu adds a substitute holiday when one of the fixed-date holidays lands on a Sunday; the substitute is the next weekday that is not itself a holiday. Citizens' Holiday adds a holiday when a single weekday sits between two existing holidays.
The Banking Act of Japan and the Bank of Japan's settlement calendar separately treat 31 December and 2 to 3 January as bank-closure days. Those dates are not statutory holidays and are not counted as such here. If your scenario depends on Zengin-Net being closed during oshogatsu, add 31 December, 2 January, and 3 January under Advanced options.
Japanese statutory holidays
The 16 kokumin no shukujitsu:
- Ganjitsu (1 January, New Year's Day)
- Seijin no Hi (2nd Monday of January, Coming of Age Day)
- Kenkoku Kinen no Hi (11 February, National Foundation Day)
- Tenno Tanjobi (23 February, Emperor's Birthday)
- Shunbun no Hi (around 20 March, Vernal Equinox Day)
- Showa no Hi (29 April, Showa Day)
- Kenpo Kinenbi (3 May, Constitution Memorial Day)
- Midori no Hi (4 May, Greenery Day)
- Kodomo no Hi (5 May, Children's Day)
- Umi no Hi (3rd Monday of July, Marine Day)
- Yama no Hi (11 August, Mountain Day)
- Keiro no Hi (3rd Monday of September, Respect for the Aged Day)
- Shubun no Hi (around 23 September, Autumnal Equinox Day)
- Sports no Hi (2nd Monday of October, Sports Day)
- Bunka no Hi (3 November, Culture Day)
- Kinrokansha no Hi (23 November, Labor Thanksgiving Day)
Vernal Equinox Day and Autumnal Equinox Day are not anchored to a specific calendar date. The National Astronomical Observatory of Japan calculates each year's equinox and the Cabinet Office gazettes the date in February of the preceding year. How we determine holidays →
Common use cases in Japan
Most Japanese listed companies close books on 31 March and file kessan tanshin within 30 to 45 calendar days under TSE listing rules. Internal close cycles, however, run on eigyobi, and Golden Week routinely costs three to five working days at the start of Q1. The Obon period in mid-August is not a statutory holiday but is treated as a working week of two to three days at most, so treasury teams stage liquidity for the gap.
Keiretsu payment culture often runs on tegata receivables with maturities measured in calendar days, but settlement at maturity executes on eigyobi through Zengin-Net. Suppliers selling into Japan should layer their domestic collection terms over this calendar to avoid surprises around Golden Week, Silver Week (the Respect for the Aged through Autumnal Equinox stretch), and oshogatsu. SLAs for managed services with Japanese clients almost always define eigyobi explicitly in the contract because counsel cannot rely on a foreign-law definition aligning with the Cabinet Office calendar.
For informational purposes only
This calculator provides general estimates based on business day counting rules. It does not constitute legal advice. Deadlines in legal, regulatory, or contractual matters may be subject to jurisdiction-specific rules, court orders, or statutory exceptions. Always verify critical deadlines with a qualified professional.