Mekler AI Cron Run Calculator

x402

Mekler AI Cron Run Calculator is a paid API for AI agents from api.mekler.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).

Calculate up to 20 upcoming scheduled fire times for a five-field cron expression in a named IANA timezone, handling DST folds and skips, strictly after a given start timestamp within a 366-day horizon.

Price / call$0.005

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StatusUnknown

How this service works

Calculate up to 20 upcoming five-field cron runs in a named IANA timezone, strictly after an explicit timestamp through a 366-day horizon. Report UTC, local offset and fold. Skip nonexistent times; choose both, first or second repeated times. Calculation only: no scheduler, job execution or delivery.

Output

A JSON object containing an array of up to 20 scheduled run times, each with a UTC timestamp, a local-time timestamp with offset, and a fold indicator (0 or 1) for DST ambiguity. Also includes metadata: the original expression, timezone, start and search-end boundaries, the repeat policy used, run count requested, and a 'complete' flag indicating whether the requested count was fully satisfied within the 366-day horizon. Limitations about cron field support and DST behavior are listed.

Example use cases

Preview weekly report schedule across DST

“I want to see the next 15 times my weekly report job will fire — it's on cron '0 8 * * MON', starting after 2025-10-25T00:00:00Z in Europe/London. Use 'both' for repeated times so I can see the DST rollback effect.”

Verify daily backup timing around spring-forward

“Can you calculate the next 5 runs of '30 2 * * *' starting after 2025-03-08T06:00:00Z in America/New_York? I want to know which one gets skipped due to the spring-forward clock change.”

Plan bi-weekly deployment windows

“Show me the next 20 fire times for cron expression '0 14 1,15 * *' after 2025-06-01T00:00:00Z in Asia/Tokyo — I need to plan my bi-weekly deployment windows for the next year.”

Technical details

Endpoint

POSThttps://api.mekler.ai/v1/data/schedules/calculate-cron-runs?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need pure cron-expression expansion with proper IANA timezone and DST handling — including explicit control over how repeated (fold=1) times are treated and automatic skipping of nonexistent times. It is a pure computation service (no side effects, no job scheduling), making it safe to call repeatedly for previewing schedules. Prefer it over generic datetime libraries when DST correctness and fold-awareness are required, or when you need to preview a full schedule window up to 366 days ahead.

Side effects

Invalid or unsupported cron expression (e.g. 6-field, uses @macros, L/W/# syntax) returns an error
Unknown or misspelled IANA timezone name returns an error
Start timestamp outside parseable date-time format returns a validation error
Requesting more than 20 runs returns a validation error
No matching runs found within 366-day horizon returns complete:false with fewer results than requested
request_id pattern mismatch (not 16-64 alphanumeric/dash/underscore chars) returns a validation error

Input

Schema · Request body

Field	Type	Description
count	integer
start	string
timezone	string
expression	string
request_id	string
repeat_policy	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "runs": [
      {
        "utc": "2026-10-20T16:30:00Z",
        "fold": 0,
        "local": "2026-10-20T09:30:00-07:00"
      },
      {
        "utc": "2026-10-21T16:30:00Z",
        "fold": 0,
        "local": "2026-10-21T09:30:00-07:00"
      },
      {
        "utc": "2026-10-22T16:30:00Z",
        "fold": 0,
        "local": "2026-10-22T09:30:00-07:00"
      },
      {
        "utc": "2026-10-23T16:30:00Z",
        "fold": 0,
        "local": "2026-10-23T09:30:00-07:00"
      },
      {
        "utc": "2026-10-26T16:30:00Z",
        "fold": 0,
        "local": "2026-10-26T09:30:00-07:00"
      }
    ],
    "start": "2026-10-20T00:00:00+00:00",
    "status": "ok",
    "complete": true,
    "timezone": "America/Los_Angeles",
    "expression": "30 9 * * MON-FRI",
    "limitations": [
      "Calculation only; no job is scheduled or delivered.",
      "Five fields: minute hour day-of-month month day-of-week. Numeric lists, ranges, steps and English month/weekday abbreviations; Sunday is 0 or 7.",
      "Day-of-month and day-of-week use OR when both fields differ from the literal *; otherwise both must match. No seconds, year, L, W, # or @ macros.",
      "Nonexistent local times are skipped. Repeated times follow repeat_policy. Search is strictly after start through 366 elapsed days.",
      "Uses the deployed IANA timezone database; future government rule changes may alter results."
    ],
    "observed_at": "2026-10-20T00:00:00Z",
    "repeat_policy": "both",
    "search_end_utc": "2027-10-21T00:00:00+00:00",
    "requested_count": 5
  }
}

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