Parse or generate an iCalendar event

Parse an RFC 5545 VEVENT or generate one interoperable UTC or all-day ICS event.

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TooliCal Parser
Input
Output
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How it works

Parsing unfolds continuation lines, separates property parameters, unescapes text, and distinguishes UTC, DATE, and TZID-labelled local values. Generation writes a VCALENDAR 2.0 wrapper with CRLF endings, escaped text, and content lines folded at 75 UTF-8 octets.

  • Parse mode is the default for pasted calendar data; generation requires UID, summary, start, and end so identity and date semantics are not invented.

Worked example

Read a folded RFC 5545 event
Unfold the summary and distinguish UTC date-time values
Input
											Mode: parse
Input: BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
SUMMARY:Team 
 standup
DTSTART:20250315T090000Z
DTEND:20250315T091500Z
LOCATION:Zoom
END:VEVENT
END:VCALENDAR
Output
												Found 1 event(s)

Title: Team standup
Start: 2025-03-15T09:00:00Z
End: 2025-03-15T09:15:00Z
Location: Zoom

When to use this

Calendar-export inspection, downloadable booking events, and scheduling integrations distinguish UTC timestamps from all-day dates.

Edge cases

  • A folded SUMMARY line is joined before its value is read.
  • A comma or semicolon inside DESCRIPTION is unescaped as text instead of treated as structural punctuation.
  • A local date-time with TZID is preserved as local rather than silently relabelled UTC.

References