Libraries
GaianCalendar
Python library for converting between Gregorian dates and the Gaian perpetual calendar. Compute Gaian year, month, day, weekday, and era from any date.
pip install GaianCalendar
C# library providing a GaianDate type backed by NodaTime for strongly-typed Gaian calendar arithmetic. Planned for release as a NuGet package.
Planned Libraries
These are on the roadmap but not yet in active development. Contributions welcome.
gaian-calendar (npm)
TypeScript/JavaScript package for Gaian Calendar conversion, formatting, and arithmetic. Would support both Node.js and browser environments with zero dependencies.
gaian_calendar (crates.io)
Rust crate implementing GaianDate as a zero-cost abstraction over a day-of-year integer, with chrono interop traits and serde support.
gaian-calendar (Maven Central)
JVM library implementing GaianDate as a java.time.temporal.TemporalAccessor, compatible with the Java time API and usable from Kotlin.
GaianCalendar (Swift Package)
Swift package providing a GaianDate struct with Codable and Comparable conformance, bridging to Foundation.Calendar for iOS and macOS apps.
gaian (Go module)
Go module for Gaian Calendar date conversion and formatting, following the conventions of the standard time package.
gaian_calendar (RubyGems)
Ruby gem extending Date with #to_gaian and providing a GaianDate class for use in Rails apps and scripts.
gaian-calendar (Composer)
PHP package wrapping DateTimeImmutable with Gaian Calendar output, suitable for use in WordPress plugins, Laravel, and other PHP applications.
Gaian Calendar Feed
Subscribable .ics calendar feeds for Gaian holidays, Sabbaths, and Gaiad chapter readings — importable into Google Calendar, Apple Calendar, Outlook, and any CalDAV client.
Gaian Calendar Plugin
Obsidian plugin that shows the current Gaian date in the status bar, generates daily notes with Gaiad chapter headings, and supports Gaian date links in the daily notes graph.
Wiki Templates
Template:GaiadDate
MediaWiki template for rendering a Gregorian date as its Gaian equivalent inline in wiki articles.