Cron Job Parser

Translate cron syntax into plain English.

Common expressions

Cron Expression

MIN(0-59)HOUR(0-23)DAY(1-31)MONTH(1-12)WEEKDAY(0-6)

Human Readable Result

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What is a Cron Job Expression and How does it Work?

A cron job is a time-based job scheduler in Unix-like computer operating systems. Developers use cron expressions to configure software scripts, server backups, or automated database maintenance tasks to run periodically at fixed times, dates, or intervals.

The Five-Field Standard

Standard cron expressions are composed of five fields separated by white space: Minute Hour Day Month Weekday. Some environments support a sixth field for seconds or years, but the five-field format remains the ubiquitous industry standard.

Cron Wildcards

Symbols configure scheduling scopes: * represents any value, , defines multiple specific values, - sets ranges, and / specifies steps or intervals (e.g. every 5 minutes: */5).

Human-Readable Translation

This parser translates complex scheduling shorthand into plain, clear English sentences. Developers can quickly verify that their automation parameters align perfectly with intended business requirements.

Secure Scheduling Configurations

Cron expressions configured in server settings or application tasks can expose sensitive internal operational logic or server run behaviors. ZeroServer parses and translates your cron expressions entirely inside your local browser tab. No scheduling logs or telemetry are ever sent to an external server.

Frequently Asked Questions

How do I read a cron expression?

A cron expression has 5 fields: minute hour day month weekday. '30 8 * * 1-5' means 8:30 AM every Monday through Friday. This tool parses the expression and shows plain-English meaning plus the next 5 run times.

What do the special cron characters mean?

* = every value; , = list (1,3,5); - = range (1–5); / = step interval (*/15 = every 15 units; 0-30/10 = values 0, 10, 20, 30). Most cron implementations support these; non-standard extensions like L (last) and W (weekday) vary by scheduler.

Why does the parser say my expression never runs?

Some combinations are impossible — for example, '30 8 31 2 *' (February 31st) can never occur. Values out of range (e.g. hour 25) are also invalid. The parser flags both impossible combinations and out-of-range values.

Should I use 0 or 7 for Sunday in the weekday field?

Both 0 and 7 represent Sunday in most cron implementations. Monday is 1 and Saturday is 6. Using 0 is safer for portability — some older or minimal cron versions don't recognize 7.

How do I run a cron job every 15 minutes?

Use */15 * * * *. The */ step notation starts at 0 and repeats every N units, so this fires at :00, :15, :30, and :45 of every hour, every day. For every 30 minutes: */30 * * * *.

Private & free — this tool runs entirely in your browser.