Validate and explain a cron expression
Validate and explain a cron expression: plain-English meaning, each field expanded, and the next run times in any time zone (DST-aware). Standard 5-field cron, 6-field with seconds, names (MON, JAN) and @daily-style macros. ?expression=*/15 9-17 * * MON-FRI&tz=Europe/London
Answeringour last check, 2026-09-28
1 of 1checks answered this week
21 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://aayatai.com/cron/explain
| Category | Everything else |
|---|---|
| Provider host | aayatai.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.001 | 21 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"count": 3,
"expression": "*/15 9-17 * * MON-FRI",
"tz": "Europe/London"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"count": {
"default": 5,
"description": "How many next run times.",
"maximum": 20,
"minimum": 1,
"type": "integer"
},
"expression": {
"description": "e.g. 0 9 * * 1-5, */15 * * * *, @daily.",
"maxLength": 120,
"minLength": 5,
"type": "string"
},
"tz": {
"default": "UTC",
"description": "IANA time zone for the next runs, e.g. Europe/London.",
"maxLength": 60,
"type": "string"
}
},
"required": [
"expression"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"description": {
"type": "string"
},
"expression": {
"type": "string"
},
"fields": {
"items": {
"type": "object"
},
"type": "array"
},
"nextRuns": {
"description": "UTC ISO times.",
"items": {
"type": "string"
},
"type": "array"
},
"tz": {
"type": "string"
},
"valid": {
"type": "boolean"
}
},
"required": [
"valid",
"description",
"fields",
"nextRuns"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}