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OCPS Implementation Conformance

Status: DRAFT

1. Introduction

This document tracks the conformance of various scheduling libraries, daemons, and standards against the different versions of the Open Cron Pattern Specification (OCPS). The goal is to provide a clear overview for developers seeking a tool that meets their specific scheduling needs.

An implementation may not support all features of a specific OCPS version. The tables below aim to capture that nuance.

2. Conformance Matrix

Legend:

  • ✅ Full: Fully supports all features of this OCPS version.
  • 🟡 Partial: Supports some, but not all, features of this version. See Notes.
  • ❌ None: Does not support the key features of this version.
  • N/A N/A: Not Applicable, as the system uses a fundamentally different syntax.

Adoption Summary

This table shows the percentage of the 17 libraries listed below that meet different levels of conformance.

Conformance Level OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4
Any Feature Adoption 100% 41% 82% 53% 47%
Full Feature Adoption 65% 41% 76% 47% 6%
Any Conformance (Cumulative) 100% 35% 24% 12% 6%
Full Conformance (Cumulative) 65% 35% 24% 6% 0%

Specifications

Specifications OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
POSIX cron 🟡 ❌ ❌ ❌ ❌ The official standard. Does not support steps (/) or month/day names. [1]

System Cron Daemons

System Cron Daemons OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
cronie ✅ ✅ ✅ ❌ ❌ A fork of Vixie-cron. Supports nicknames and seconds. [3][4]
vixie-cron / isc-cron ✅ ✅ ❌ ❌ ❌ The de facto standard for system cron. [1][2][5]
dcron ✅ ✅ ❌ ❌ ❌ A simple and lightweight implementation that supports nicknames. [6]

Java Libraries

Java Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
Spring Framework (@Scheduled) 🟡 ❌ ✅ ✅ 🟡 Supports seconds, L, W, #. Uses AND logic for date fields. ? is a wildcard. No nicknames. [7]
Quartz 🟡 ❌ ✅ ✅ 🟡 Original source for L, W, #. Does not allow combining dom and dow, but requires ? to disambiguate date fields. No nicknames. [8][9]

.NET Libraries

.NET Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
Cronos 🟡 ✅ ✅ ✅ 🟡 Supports seconds, nicknames, and advanced characters. Uses AND logic for date fields. [11]
Coravel ✅ ❌ ❌ ❌ ❌ Provides basic cron string support but encourages a fluent API.

Rust Libraries

Rust Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
croner-rust ✅ ✅ ✅ ✅ 🟡 Allows ? as an alias for *. [12]
cron 🟡 ❌ ✅ ❌ ❌ Weekday numbering differs. Supports seconds but not nicknames or other extended features. [13][14]
saffron 🟡 ❌ 🟡 ✅ 🟡 Quartz-like, uses AND logic for date fields. Does not support seconds. Weekday numbering differs. [15][16]

Go Libraries

Go Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
gocron (robfig/cron) ✅ ✅ ✅ ❌ 🟡 Supports seconds & nicknames. ? is alias for *. No L, W, #. [17]
go-quartz 🟡 ❌ ✅ ✅ ❌ Requiring ? to disambiguate date fields. No nicknames. [18]

JavaScript / TypeScript Libraries

JavaScript / TypeScript Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
croner (JS/TS) ✅ ✅ ✅ 🟡 ✅ Defaults to OCPS OR logic. W is not supported. ? is for substitution. Provides an optional AND mode. [19]
node-schedule ✅ ❌ ✅ ❌ ❌ Supports seconds but not nicknames or other extended syntax.
node-cron ✅ ❌ ✅ ❌ ❌ Supports seconds.
cron (npm) ✅ ❌ ✅ ❌ ❌ Supports seconds. [20][21]
cron-parser ✅ ❌ ✅ ✅ 🟡 Supports seconds, L, #. ? is alias for *. No W or nicknames. [22]

PHP Libraries

PHP Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
dragonmantank/cron-expression ✅ ✅ ❌ ✅ ❌ A popular foundational library. Supports L, W, #, and nicknames. Does not support seconds.

Python Libraries

Python Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
python-crontab ✅ ✅ ❌ ❌ ❌ Designed to manage system crontabs. Supports nicknames. No advanced characters.

Ruby Libraries

Ruby Libraries OCPS 1.0 OCPS 1.1 OCPS 1.2 OCPS 1.3 OCPS 1.4 Notes
Sidekiq-Cron ✅ ✅ ✅ ❌ ❌ Supports seconds and natural language parsing via the Fugit gem. No support for L, W, #.

References

Reference URL
1 https://en.wikipedia.org/wiki/Cron
2 https://github.com/vixie/cron
3 https://wiki.gentoo.org/wiki/Cron
4 https://manpages.ubuntu.com/manpages/jammy/man8/cron.8.html
5 https://medium.com/bumble-tech/cron-in-linux-history-use-and-structure-70d938569b40
6 https://www.jimpryor.net/linux/dcron.html
7 https://productresources.collibra.com/docs/collibra/latest/Content/Cron/co_spring-cron.htm
8 https://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/crontrigger.html
9 https://docs.oracle.com/cd/E12058_01/doc/doc.1014/e12030/cron_expressions.htm
11 https://github.com/HangfireIO/Cronos
12 https://crates.io/crates/croner/1.0.2
13 https://docs.rs/cron
14 https://www.twilio.com/en-us/blog/developers/community/run-cron-jobs-rust
15 https://github.com/cloudflare/saffron
16 https://news.ycombinator.com/item?id=41654723
17 https://www.scalent.io/golang/golang-cron-job-example/
18 https://github.com/reugn/go-quartz
19 https://www.npmjs.com/package/croner
20 https://www.npmjs.com/package/cron
21 https://npm-compare.com/cron,node-cron,node-schedule
22 https://www.npmjs.com/package/cron-parser

This document is automatically generated from data/conformance.json on 2025-10-28.

This table is based on analysis of official documentation and community knowledge. For the most accurate details, please refer to the documentation of the respective libraries.