Japan — 2026年一月

Japan businesses have 20 working days in 一月 2026 — that's 31 calendar days minus 9 weekend days and 2 weekday public holidays (New Year's Day, Coming of Age Day). The depth of Northern-hemisphere winter and Southern-hemisphere summer typically governs the work-rhythm in 一月; project deadlines and payroll cycles in Japan should account for the holiday days listed above. January opens the global calendar with New Year's Day observed in nearly every country and several civic holidays unique to the southern hemisphere. For pay-period planning, 一月 2026 contains 4 full work-weeks plus 0 additional weekdays, useful when scheduling milestones or quarterly reviews. The working-day count above counts substitute days as a single deduction — it does not double-count when a public holiday falling on a weekend is moved to a Monday or Friday. Use this figure as the authoritative baseline for Japan payroll-period calculations.