RRule Converter

About This Tool

The rrule converter accepts an RRULE string and a start date (DTSTART) and returns a machine readable list of upcoming occurrences and a concise human readable description of the rule. It supports common RFC5545 components such as FREQ, INTERVAL, BYDAY, BYMONTH, BYMONTHDAY, UNTIL and COUNT. The inputs are designed for backend use or API integration, allowing teams to validate rules without implementing calendar logic locally.
How it works conceptually: the tool parses the RRULE into a canonical representation, applies the DTSTART and timezone, and iterates occurrences according to the rule until a limit is reached or until date provided. It then formats a description like Every 2 weeks on MO, WE and returns a sample occurrences array with ISO 8601 timestamps.
Audience and value: developers, QA engineers, schedule managers, and data engineers benefit from deterministic outputs, test data generation, and rapid rule verification. Unique differentiators include RFC5545 focused parsing, clear human descriptions, and deterministic sample sequences suitable for automated testing.

Sign in to see all your usage