Cron Expression Parser
Paste a cron expression or build one field by field and get a plain-English description, a live countdown, the next and previous run times in any IANA timezone (with DST warnings) and a weekday × hour heatmap. Detects standard 5-field, 6-field with seconds, Quartz, AWS cron(…), CRON_TZ prefixes and @daily-style macros, and exports crontab lines, GitHub Actions schedules, Kubernetes CronJob manifests, AWS EventBridge, Quartz and systemd OnCalendar.
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How to use Cron Expression Parser
- 1Paste an expression (crontab, seconds-first, Quartz, AWS cron(…) or @daily) — the dialect is detected and each field is described.
- 2Or open Builder and pick Every / Specific / Range / Step for each field to generate the expression.
- 3Choose a timezone to see the next and previous runs, the live countdown and any DST change inside the list.
- 4Read the weekday × hour heatmap to sanity-check when the job fires.
- 5Copy the schedule as a crontab line, GitHub Actions workflow, Kubernetes CronJob, AWS EventBridge, Quartz or systemd OnCalendar.
About Cron Expression Parser
Paste a cron expression or build one field by field and get a plain-English description, a live countdown, the next and previous run times in any IANA timezone (with DST warnings) and a weekday × hour heatmap. Detects standard 5-field, 6-field with seconds, Quartz, AWS cron(…), CRON_TZ prefixes and @daily-style macros, and exports crontab lines, GitHub Actions schedules, Kubernetes CronJob manifests, AWS EventBridge, Quartz and systemd OnCalendar.
Cron Expression Parser is part of FizzKit — a collection of focused developer and ad-tech tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.