Ships with a custom field type for recurring (repeating) dates based on ICAL rules.
Views support for individual date values.
Install this module using the official Backdrop CMS instructions
Then you can add the "Date (repeating)" field to content types. Note that it's really a standalone field type - you can not use any of the other Date field types as base for recurring dates.
The field cardinality global setting controls the max amount of date values, that get saved to the database. Make sure that this value is high enough.
Bugs and feature requests should be reported in the Issue Queue.
To calculate the list of dates, this module uses the MIT licensed RRULE for PHP library by Rémi Lanvin (rlanvin)
This module is inspired by, but in no way similar to Date Repeat, which is currently getting ported - but that turned out to be very difficult, as it's an incomplete stub.
This project is GPL v2 software. See the LICENSE.txt file in this directory for complete text.