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This tool does not test the frequency validity but just try to make it easily readable.
The PHP class that does the work is available on GitHub.

Enter a cron job frequency

Few examples

Raw Minute Hour Day of month Month Day of week Result
30 19 1 * * 30 19 1 * * every 1st of the month at 19:30
5 */2 * * 6,7 5 */2 * * 6,7 at the 5th minute of every 2 hour on weekend
0 9 * * 1 0 9 * * 1 at 09:00 of every monday
0 0 * 2-3 * 0 0 * 2-3 * at midnight every day from february to march
0 12 * * 1-5 0 12 * * 1-5 at midday from monday to friday
By Louis