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Recurring Dates & RRULE
Build or explain a repeat rule like "last Friday of every month" and list every date it falls on.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Recurring Dates & RRULE works
Worked out in your browser with your device clock and time zone. Calendar files follow the iCalendar standard (RFC 5545), so Google, Apple and Outlook all open them.
Input: Settings, RRULE. Output: TXT, ICS.
How to use Recurring Dates & RRULE
- Pick how often and on which days.
- Set when it ends.
- Read the dates or download a repeating event.
Tips
- Times use your device time zone. Calendar files store times in UTC, so everyone sees their own local time.
- ICS files open in Google Calendar, Apple Calendar and Outlook.
Recurring Dates & RRULE FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Calendar Event Maker (ICS): Make an .ics invite with reminders and repeats, plus Add to Google and Outlook calendar links.
- Cron Explainer: Explain cron expressions and preview next run times.
- Merge Calendar Files: Combine ICS calendars into one, remove duplicates and keep only a date range or events with a word.
- Spreadsheet to Calendar: Turn a CSV or Excel schedule into an ICS file you can import into Google, Apple or Outlook calendar.