WebToolArcCron Tools
Build, parse, test and migrate cron schedules with explicit UTC boundaries, validation and deployment-focused checks.
Build & understand
Start from an expression, decode each field, and generate a schedule deliberately.
Run timing
Inspect future, previous and bounded schedule behavior before deployment.
Cron Next Run Calculator
Calculate the next matching UTC run times for a standard five-field Unix cron expression.
Cron ToolsCron Previous Run Calculator
Calculate previous matching UTC run times for a standard five-field Unix cron expression.
Cron ToolsCron Date Matcher
Check whether one UTC date and minute matches a standard Unix cron expression.
Cron ToolsCron Occurrence Counter
Count how many times a cron schedule matches inside a UTC date range.
Cron ToolsCron Gap Analyzer
Analyze minimum, maximum, and average gaps between upcoming cron runs.
Validate & regression-test
Catch malformed files, collisions and expected-match mistakes locally.
Crontab File Validator
Validate schedule fields across a multi-line user crontab file.
Cron ToolsCrontab Command Extractor
Extract schedule expressions and commands from a user crontab file.
Cron ToolsCron Schedule Overlap Checker
Find UTC minutes where two standard Unix cron schedules run at the same time.
Cron ToolsCron Test Case Runner
Run should-match and should-not-match UTC date test cases against one cron expression.
Cron ToolsAWS EventBridge Cron Validator
Validate the six-field shape and common day-field rules of an Amazon EventBridge Scheduler cron expression.
Migrate dialects carefully
Convert only the subset that can be represented without pretending incompatible semantics are equivalent.