This is a complete, production-ready, single-file solution. It includes all logic, styles, and markup. It utilizes Tailwind CSS for styling and `cron-parser` for robust scheduling calculations. Save the following code as an `.html` file and open it in any browser. ```html Free CronTab Schedule Expression Parser & Execution Previewer

CronTab Schedule Expression Parser

Instantly preview upcoming execution dates for your cron expressions.

Cron Expression

Explanation

Enter an expression to see a detailed breakdown.

Next 5 Executions

Awaiting valid expression...

Local Timezone: Parser v4.9