These are some sites i use to do specific jobs, i hope they can serve you well too.
Corntab
Corntab is a simple crontab web GUI
With Corntab you can ensure that you always have the correct crontab syntax.
Don’t worry about forgetting the proper crontab format because Corntab let’s you click on all of the crontab options and outputs your crontab entry in real-time.
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