Observed arrival · 2026-10-21
CronExplain: a field guide to cron schedules
A browser-based tool that explains cron expressions, previews their next run times, and converts schedules across several scheduler dialects.
- For
- People configuring scheduled jobs across different platforms
- Worth noticing
- It explains that daylight-saving gaps are skipped and repeated times run once, and switches AWS EventBridge and GitHub Actions schedules to UTC.
Field notes
The page distinguishes five-field standard crontab from dialects with different field counts and weekday conventions, and notes that Quartz and AWS require a question mark in either the day-of-month or day-of-week field. Its run-time explanation uses wall-clock time in the selected zone, with a separate local-time column; for AWS EventBridge and GitHub Actions it switches to UTC. The captured run-preview rows contain dashes, though the page describes the intended ten-run output.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue