Free tool to validate clock time strings. Check if your HH:MM or HH:MM:SS input is valid in 12-hour or 24-hour format instantly. Accurate and developer-friendly.
Standard 24-Hour Validation
Our validator checks if the hour component is between 00 and 23. This ensures that technical logs and military-time inputs are formatted correctly for database storage.
12-Hour (AM/PM) Support
Testing for human-readable time? This tool recognizes AM and PM suffixes and enforces the 1-12 hour rule used in standard wall clocks.
Instant Syntax Highlighting
As you type, the interface provides real-time feedback. Green indicates a valid timestamp ready for use, while red highlights logic errors in the time string.
Frequently Asked Questions
Is 24:00 a valid time? Technically, most digital systems represent the end of the day as 00:00 of the following day. Our validator follows standard ISO 8601 logic (00-23).
Can I check seconds? Yes! The tool supports HH:MM and HH:MM:SS formats seamlessly.