# HangfireIO/Cronos

A fully-featured .NET library for working with Cron expressions. Built with time zones in mind and intuitively handles daylight saving time transitions

Repository: https://github.com/HangfireIO/Cronos
Canonical: https://ross.abutalabs.com/products/cronos
Language: C#
License: MIT
License Family: permissive
Topics: dotnet, dotnet-core, cron-expression, cron
Last push: 2026-04-29T09:24:20+00:00

## Health v2 (maintenance only)
Score: 80/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 79, release rhythm 69, longevity 100
- inputs: {"age_days": 3521, "days_push": 126, "days_rel": 126, "gap_med": 85, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1191, forks 134 (observed 2026-08-28T04:03:56.088096+00:00)

## What it is
Cronos is a .NET library for parsing Cron expressions and calculating their next occurrences. It handles time zones and daylight saving time transitions correctly, matching the behavior of *nix Cron, but does not include a job scheduler itself.

## Use cases
- parse cron expressions in .NET
- calculate next occurrence of a cron schedule
- handle cron schedules across time zones
- handle daylight saving time transitions in scheduled jobs
- validate user-provided cron expressions
- compute cron schedule occurrences without a full scheduler

## When to choose
- you need cron expression parsing and occurrence calculation in a .NET application
- correct time zone and DST handling is important for your schedules
- you want support for non-standard cron characters like L, W, #, and H
- you are building your own scheduler and need a reliable cron engine

## When to avoid
- you need a full task or job scheduler, not just cron parsing
- you need Quartz.NET-style cron syntax compatibility with OR day matching
- your project is not on the .NET platform

## Facets
- artifact type: library
- maturity: stable
- function: parser, scheduling, date-time
- domain: developer-tools, backend
- platform: dotnet, cross-platform
- tags: cron-expressions, time-zones, daylight-saving-time, scheduler-utility, automation

## Member repositories
- HangfireIO/Cronos (main) score 80

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:56.088096+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 2026-08-30T06:22:39.887011+00:00, confidence not recorded.
  - readme: https://github.com/HangfireIO/Cronos (fetched 2026-08-28T04:03:56.088096+00:00, sha 20c0b66865e5)
- Data as of 2026-08-30T08:39:29.467469+00:00.