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*/15 * * * * or 0 2 1 * *) is the universal standard for scheduling recurring background tasks, database backups, email digests, and CI/CD pipelines across Linux servers, GitHub Actions, AWS EventBridge, and Kubernetes. However, deciphering complex multi-field cron syntax with special wildcard characters (*, /, -, ,, L, W) manually is error-prone. The Cron Expression Descriptor & Schedule Validator translates cryptic cron expressions into clear, plain English sentences and calculates the exact next 10 scheduled execution dates in real time.A standard Unix / Linux crontab expression consists of 5 positional fields separated by spaces (or 6 fields in Quartz/AWS adding seconds):
$$\begin{array}{cccccc}
\text{┌─────────────} & \text{Minute} & (0-59) \\
\text{│ ┌───────────} & \text{Hour} & (0-23) \\
\text{│ │ ┌─────────} & \text{Day of Month} & (1-31) \\
\text{│ │ │ ┌───────} & \text{Month} & (1-12 \text{ or JAN-DEC}) \\
\text{│ │ │ │ ┌─────} & \text{Day of Week} & (0-6 \text{ or SUN-SAT, where 0/7=SUN}) \\
\end{array}$$
*): Matches every possible value in that field.,): Value list separator (e.g. 1,15,30 runs at minutes 1, 15, and 30).-): Value range (e.g. MON-FRI runs on weekdays)./): Step increments (e.g. */15 in the minute field runs every 15 minutes).?): Used in Quartz / AWS EventBridge to specify 'no specific value' for Day of Month or Day of Week..github/workflows scheduled triggers on repository branches.*/15 * * * * or 0 9 * * 1-5) into the Cron Input field.*), Step increments (/), Ranges (-), Lists (,), and ? wildcards.Scenario: Validating a cron job for sending morning summary emails.
0 9 * * 1-5
Description: 'At 09:00 AM, Monday through Friday' | Status: Valid ✅
Translates weekday morning schedule into plain English.
Scenario: Checking a database sync job running around the clock.
*/15 * * * *
Description: 'Every 15 minutes' | Next Run: Current time + next 15-min mark
Calculates recurring interval schedule and upcoming execution times.