Web Reference: HTML form validation can be done by JavaScript. If a form field (fname) is empty, this function alerts a message, and returns false, to prevent the form from being submitted: How can I help/validate/force user to compile Hours and Minutes values in the only allowed HH:mm format using Javascript? Valid time range: from 00:00 to 23:59. * I can't use Jquery and of course I will double check the submitted value server side. Related question, stackoverflow.com/questions/1038754/time-input-field . Jan 16, 2026 · This guide will walk you through validating HH:mm input using plain JavaScript (no jQuery). We’ll cover multiple methods, real-time validation, edge cases, and form integration—so you can implement robust time validation in your projects.
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