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cron-and-intervals

Use when building a val that runs on a schedule — periodic jobs, recurring tasks, polling, cron jobs, monitoring, alerting. Covers the interval handler signature, cron expressions, the UTC timezone constraint, and the `lastRunAt` pattern for detecting new items since the previous run.

plugins/val-town/plugins/skills/cron-and-intervals/SKILL.md

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Nov 6, 2026
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# Cron / Interval Vals

Interval vals (`fileType: "interval"`) run on a recurring schedule defined by a cron expression. Use them for polling external APIs, sending reminders, running cleanups, generating reports, or any work that should happen on a clock rather than in response to a request.

## Basic handler

```ts
// Learn more: https://docs.val.town/vals/cron/
export default async function (interval: Interval) {
  // interval.lastRunAt: Date | undefined
  console.log(interval);
}
```