Are execution times displayed in UTC or my local timezone?

Both. The calculator displays the exact ISO/UTC timestamp and your browser's converted local timezone for easy cross-referencing.

Updated: August 2026 • Verified v1.2

Crontab Schedule Next Runs Calculator & Simulator

Developer ToolsHigh Usage

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.

Cron Schedule AST Evaluation: Expression ➔ Sequential Timestamp Simulation

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Understanding Your Results

Parses POSIX crontab syntax into an execution tree and simulates time advancement to determine the exact next 10 trigger timestamps in both UTC and local browser timezone.

Practical Guidance & Next Steps

Always verify cron expressions using an execution previewer to avoid unintended rapid-fire triggers.

What is this?

A cron schedule simulator that calculates the exact next 10 upcoming trigger timestamps for any 5-part crontab expression.

How does it work?

1. Enter any 5-part crontab expression (e.g. `*/15 * * * *`) or pick a preset. 2. Instantly view the upcoming 10 trigger dates and times in UTC and local time. 3. Copy the full schedule list in 1 click.