Which recurrence frequencies are supported?

The tool supports DAILY, WEEKLY, MONTHLY, and YEARLY frequencies, including common rule parts like INTERVAL, COUNT, UNTIL, BYDAY, and BYMONTHDAY.

Can I process multiple events at once?

Currently, the tool parses and expands only the first VEVENT block found in your input.

How do the holiday exclusions work?

By entering dates in YYYY-MM-DD format (one per line), the tool will automatically skip generating an occurrence if it falls on any of those specified dates.

What happens if my recurrence rule goes on forever?

If your RRULE lacks a COUNT or UNTIL parameter, the tool uses the 'Max Occurrences' setting (defaulting to 100) as a safety cap to prevent infinite loops.

What output formats can I choose?

You can export the expanded occurrences as a structured JSON array, a flattened static ICS calendar file, or both simultaneously.

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ICS Calendar Recurrence Rule Expander

Expand RRULE-based VEVENT recurrence into concrete occurrences and export them as JSON or a flattened ICS calendar

Details

What this tool helps you do

Paste a full .ics payload or a single VEVENT block, then expand its RRULE into concrete event instances. The tool understands common RRULE parts including FREQ, INTERVAL, COUNT, UNTIL, BYDAY, and BYMONTHDAY.

How to fill the form:

ICS or VEVENT Input: paste the calendar text directly
ICS File: upload a .ics file instead of pasting
Timezone Override: optionally attach a timezone label to the exported calendar header
Holiday Dates: provide YYYY-MM-DD dates, one per line, to exclude occurrences on those days
Max Occurrences: safety cap for expansion when the RRULE has no COUNT
Output Format: return JSON, ICS, or both in the result payload

Current scope:

Expands the first VEVENT found in the input
Supports DAILY, WEEKLY, MONTHLY, and YEARLY frequencies
Uses UTC-style normalization for generated output

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

1 examples

Expand a weekly team calendar rule

Turn a VEVENT with BYDAY-based weekly recurrence into explicit meeting instances and optionally skip public holidays.

{"result":{"occurrences":[{"start":"2026-04-01T09:00:00.000Z"}]}}

Inputs

Set the required fields, then run the tool.

6 options

FilesUpload source files for this workflow.1

ICS FilefileOptional

Single file max size: 5.0 MBSupported types: text/calendar, text/plain, application/octet-stream, .ics

ContentPaste or type the main input values.3

ICS or VEVENT InputtextareaOptionalTimezone OverridetextOptionalHoliday DatestextareaOptional

SettingsAdjust formats, ranges, numbers, and modes.2

Max OccurrencesnumberOptionalOutput FormatselectOptional

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

ICS Calendar Recurrence Rule Expander

What this tool helps you do

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Prepared example runs

Inputs

Result

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Prepared example runs

Inputs

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Extracting weekly syncs excluding holidays

2. Flattening a recurring event for legacy systems

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