# */15 9-17 * * 1-5

**Every 15 minutes between 09:00 and 17:59, Monday through Friday**

- Expression: `*/15 9-17 * * 1-5`
- Timezone: UTC
- Frequency: approximately 25.71 runs per day (25.71/day)

## Fields

| Field | Value | Meaning |
| --- | --- | --- |
| Minute | `*/15` | Every 15 minutes. |
| Hour | `9-17` | At 09:00, 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, 16:00 and 17:00. |
| Day of month | `*` | Every day of the month. |
| Month | `*` | Every month. |
| Day of week | `1-5` | On Monday, Tuesday, Wednesday, Thursday and Friday. |

## Next runs (UTC)

- Wed, 2026-09-02, 16:30 — `2026-09-02T16:30:00.000Z`
- Wed, 2026-09-02, 16:45 — `2026-09-02T16:45:00.000Z`
- Wed, 2026-09-02, 17:00 — `2026-09-02T17:00:00.000Z`
- Wed, 2026-09-02, 17:15 — `2026-09-02T17:15:00.000Z`
- Wed, 2026-09-02, 17:30 — `2026-09-02T17:30:00.000Z`

## Warnings

### Interpreted in UTC (info)

A cron expression has no timezone of its own — the scheduler's zone decides when it fires. These times are computed in UTC. The same expression on a host in another zone runs at a different moment.

**Fix:** Set the schedule timezone explicitly (TZ= or CRON_TZ= in crontab, `timeZone` in Kubernetes, or the scheduler's own setting). Vercel Cron Jobs always run in UTC.

---

Canonical URL: https://crontoenglish.com/cron/every-15-minutes-during-business-hours
JSON API: `GET https://crontoenglish.com/api/v1/explain?expression=...`
MCP endpoint: `https://crontoenglish.com/api/mcp`