# Cron Next-Run Calculator

> Cron Next-Run Calculator is a paid API for AI agents from schedule-tools.use.x402atlas.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Calculates future scheduled run times for POSIX five-field cron expressions, respecting IANA timezones and configurable daylight-saving time (DST) policies.

## Facts

- Endpoint: POST https://schedule-tools.use.x402atlas.com/cron-next
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cron-next-run-calculator-c4f99f4a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_teY3SUhvSCwpJ7LimfiXl

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability cron-next-run-calculator-c4f99f4a -d '<json body>'
```

Example prompt: What are the next 5 run times for the cron expression '0 8 * * MON-FRI' in the America/Chicago timezone, skipping any DST-gap times?

## When to prefer this

Use this endpoint when you need precise, timezone-aware future execution times for POSIX cron schedules — especially when DST transitions must be handled explicitly (skip, duplicate, or error). Prefer this over generic date arithmetic when the input is a cron string rather than an interval or RRULE recurrence pattern. For iCalendar RRULE-based schedules, use the sibling RRULE expander instead.

## Known failure modes

- Invalid cron expression (non-five-field or unsupported syntax) returns a validation error
- Unrecognized IANA timezone string returns an error
- Requested count exceeds bounded maximum returns an error
- Start datetime in a DST gap with strict policy returns an error
- Malformed request body returns HTTP 400

## How this service works

Cron next-run calculator — generate future times for bounded five-field POSIX cron schedules in IANA timezones with explicit daylight-saving (DST) policies.

## Output

Returns a list of future fire times in RFC 3339 format for the given cron expression, honoring the specified IANA timezone and DST handling policy (e.g., skip, repeat, or error on ambiguous/gap times). Each timestamp is explicitly offset-qualified.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cron-next-run-calculator-c4f99f4a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from schedule-tools.use.x402atlas.com](https://www.zero.xyz/host/schedule-tools.use.x402atlas.com/llms.txt)