Cron / schedule explainer

Explain a 5-field cron (minute hour DOM month DOW) and show the next UTC run times, plus GitHub Actions, Logic Apps, and systemd sketches.

Cron expression

Fields: minute (0–59) · hour (0–23) · day (1–31) · month (1–12) · weekday (0–6, Sun=0)

Summary

minute in [0, 15, 30, 45]; hour 9–17; every day-of-month; every month; weekday Mon–Fri

Next 5 runs (UTC)

2026-08-26T09:00:00Z
2026-08-26T09:15:00Z
2026-08-26T09:30:00Z
2026-08-26T09:45:00Z
2026-08-26T10:00:00Z

Other schedulers (sketches)

GitHub Actions (UTC)

schedule:
  - cron: "*/15 9-17 * * 1-5"

Azure Logic Apps recurrence

{
  "frequency": "Week",
  "interval": 1,
  "schedule": {
    "hours": [
      9,
      10,
      11,
      12,
      13,
      14,
      15,
      16,
      17
    ],
    "minutes": [
      0,
      15,
      30,
      45
    ],
    "weekDays": [
      "Mon",
      "Tue",
      "Wed",
      "Thu",
      "Fri"
    ]
  }
}

systemd OnCalendar (first matching hour/minute)

OnCalendar=Mon,Tue,Wed,Thu,Fri 09:00:00

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