CSV to ICS / CSV to iCal / calendar file generator / .ics builder / Google Calendar + Outlook + Apple Calendar import. RFC 5545 compliant VCALENDAR/VEVENT output. Auto-detects column mapping (summary, date, time, location, description) or accepts an explicit mapping. Handles all-day and timed events, configurable default duration, custom delimiters. Up to 1000 rows. Pure parser, no upstream API.