Observed arrival · 2026-11-14

OnCalendar.dev’s systemd timer workbench

oncalendar.dev Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

An interactive tool for validating systemd OnCalendar expressions, explaining them in plain English, previewing run times, and converting cron schedules.

Landing page captured for the 2026-11-14 issue.

For: People configuring systemd timers or translating cron schedules
Worth noticing: The footer identifies version 1.1.0 and says the tool is verified against systemd 262.1.

Field notes

The explainer accepts up to 10 expressions per line and combines their runs, then shows normalized syntax and scheduled times for a selected timezone, with an option to show UTC. Separate routes cover cron conversion and timer generation; the page also offers copy controls and examples such as quarterly schedules and the last day of a month. Its footer identifies v1.1.0 and states that the tool is verified against systemd 262.1.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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