Validate a Clock Time

If you need to verify a list of times like 14:30 or 09:15, the Validate a Clock Time Tool helps you quickly confirm whether each entry follows the proper 24-hour clock format. It checks every line you enter and marks each one as valid or invalid in real time. You can paste in your data or import a file, and see results update instantly no reloads or setup required.

This tool looks for properly formatted times using the HH:MM format, flagging anything that’s outside the range of valid hours or minutes.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .log
Total items: 0
Options
Trim whitespace
Ignore blank lines
Show only invalid times

How to Use:

  1. Paste your times in HH:MM format into the Input Times box.
  2. Or import a file using the Choose File button (supports .txt, .csv, .log).
  3. In the Options section:
    • Toggle Trim whitespace to clean up lines automatically.
    • Toggle Ignore blank lines to exclude empty entries.
    • Toggle Show only invalid times to filter out valid results.
  4. The Validation Results area updates live with status markers.
  5. Use Copy Output or Export to File to save your results.
  6. Click Clear All to reset the tool.

What Validate a Clock Time Tool can do:

  • Checks each line for a valid 24-hour HH:MM time format
  • Flags entries that fall outside valid hour or minute ranges
  • Optionally filters the view to show only problematic entries
  • Works with both direct input and file-based lists
  • Provides a live count of processed entries and updates in real time

Example:

Input:

14:30
25:00
09:15
07:61
23:59

Output:

14:30 valid
25:00 invalid
09:15 valid
07:61 invalid
23:59 valid

With “Show only invalid times” turned on:

25:00 invalid
07:61 invalid

Common Use Cases:

This tool is helpful for cleaning up schedule entries, checking exported time logs, validating shift rosters, or reviewing time-stamped data. Instead of manually reviewing or building scripts to validate entries, you can instantly verify clock times and spot issues with minimal effort.

Useful Tools & Suggestions:

Need examples to work with? Generate Valid Clock Times gives you clean input to test. And if you’re checking edge cases, Generate Invalid Clock Times helps reveal what might break.

Related Tools