# jkbrzt/rrule

JavaScript library for working with recurrence rules for calendar dates as defined in the iCalendar RFC and more.

Repository: https://github.com/jkbrzt/rrule
Canonical: https://ross.abutalabs.com/products/rrule
Homepage: https://jkbrzt.github.io/rrule
Language: TypeScript
License: NOASSERTION
License Family: other
Topics: recurrence-rules, javascript, rrule, library, calendar, icalendar-rfc, rfc, python-dateutil, jakubroztocil, typescript
Last push: 2024-06-27T17:52:15+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5131, "days_push": 797, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3741, forks 563 (observed 2026-08-28T04:08:15.972254+00:00)

## What it is
rrule.js is a JavaScript/TypeScript library for creating, parsing, and querying recurrence rules for calendar dates as defined in the iCalendar RFC 5545. It is a partial port of Python's dateutil rrule module and additionally supports converting rules to and from human-readable natural language text.

## Use cases
- generate recurring calendar event dates in javascript
- parse iCalendar RRULE strings
- convert recurrence rules to human-readable text
- compute occurrences of a repeating event between two dates
- build a scheduling feature with weekly/monthly repeats
- handle recurring events with timezones in a web app

## When to choose
- you need RFC 5545-compliant recurrence expansion in JavaScript or TypeScript
- you want natural-language parsing/serialization of recurrence rules
- you need timezone-aware recurring date computation in browser or Node

## When to avoid
- you need full iCalendar file (.ics) generation rather than just RRULE logic
- you work outside JavaScript/TypeScript ecosystems
- you need calendar UI components rather than date computation

## Facets
- artifact type: library
- maturity: stable
- function: date-time, parser, serialization
- domain: developer-tools, web-development
- platform: browser, cross-platform
- tags: recurrence-rules, icalendar, rrfc-5545, calendar, scheduling, natural-language-parsing, javascript, nodejs, typescript

## Member repositories
- jkbrzt/rrule (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:15.972254+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:29:06.961983+00:00, confidence not recorded.
  - readme: https://github.com/jkbrzt/rrule (fetched 2026-08-28T04:08:15.972254+00:00, sha 993041e71116)
  - homepage: https://jkbrzt.github.io/rrule (fetched 2026-08-29T09:23:48.395763+00:00, sha 2175c0b36d32)
- Data as of 2026-08-30T08:39:29.467469+00:00.