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Build a one-off .ics change window in UTC, plus a weekday working-hours sketch for the timezone you care about.
ICS (UTC)
BEGIN:VCALENDAR VERSION:2.0 PRODID:-//chadd.ie//IT Tools//EN CALSCALE:GREGORIAN BEGIN:VEVENT UID:change-window@chadd.ie DTSTAMP:20260817T205900Z DTSTART:20260816T220000Z DTEND:20260817T020000Z SUMMARY:Change window END:VEVENT END:VCALENDAR
Sketch
RRULE:FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR Working hours 09:00–17:00 Europe/Dublin