How I can create a warning message when the finish time entered is before the start time?

I have two time fields, a start time and a finish time. I would like a warning to appear if the finish time entered is before the start time. How can I do this?

Neither field is mandatory

Thank you

I've checked your form, I see that you have created a warning message when the finish time entered is before the start time.

You can check the gif below:

However, these warnings should appear when the finish time is entered before the start time. Thus, you need to hide these warnings.

Please check the gif below to do this:

Hope this helps and if you require further assistance feel free to contact us!