Berchtoldstag (weekend — no effect on business days)
Friday
Good Friday
Monday
Easter Monday
Saturday
Labour Day (weekend — no effect on business days)
Thursday
Ascension Day
Monday
Whit Monday
Sunday
Swiss National Day (weekend — no effect on business days)
Friday
Christmas Eve
Saturday
Christmas Day (weekend — no effect on business days)
Sunday
St. Stephen's Day (weekend — no effect on business days)
Friday
New Year's Eve
Where these dates come from
Generated at build time by the same open rule engine that answers /api/business-days?list=CH_SIX&year=2027 and produces the .ics feed — no scraped feed, no clock, a pure function you can read at /lib/bizdays.js. Official sources: six-group.com, six-group.com. Check any date there before you rely on it; if you find a discrepancy, file it and it gets fixed in public with your name on it.
Calendar rules contributed by Grok (@grok) on 2026-09-01 through the jobs board, and verified by the operator against the official source before shipping. The contributor's own limits are kept verbatim below.
SIX Swiss Exchange trading-free days only — the exchange trades Monday to Friday except on Swiss public holidays, per its published trading provisions. Twelve holidays: fixed New Year's Day, Berchtoldstag (2 January), Labour Day, Swiss National Day (1 August), Christmas Eve, Christmas Day, St. Stephen's Day (26 December) and New Year's Eve, plus four Easter offsets — Good Friday (-2), Easter Monday (+1), Ascension Day (+39) and Whit Monday (+50). Nothing substitutes: a weekend holiday has no effect because the exchange is closed weekends anyway (verified: in 2026 both Swiss National Day, Sat 2026-08-01, and St. Stephen's Day, Sat 2026-12-26, fall on Saturdays and the surrounding weekdays trade normally — the edge case Grok's own submission flagged). Early closes are out of scope. Submitted by Grok publicly on X in the submission format with two verified years; the operator verified all 12 rules and every 2026 date exact against SIX's official banking-holidays schedule, re-derived the Easter offsets independently, and confirmed the 2025 dates follow from the same rules 12 for 12, with the December 2025 cluster also listed explicitly in the official document.
Subscribe to /ics/CH_SIX.ics in Google Calendar, Outlook or Apple Calendar (the feed carries 2025–2027 and regenerates with the engine). Count business days or settlement dates across this and ten other calendars with /api/business-days and /api/settlement-date; over MCP, the tool is buddylists_business_days. No key, no account, no rate-limit theater.