How to Validate 24-Hour Time Format in EspoCRM Using a Formula

[IshitaRana]

Hi,

I have a Text field in EspoCRM called startTime, and I want to ensure that users enter the time in 24-hour HH:mm format (e.g., 09:30, 23:45).

I’m looking for a formula that can validate this field and show an error if the input is not in the correct format.

[shalmaxb]

Use a regex expression. You can generate here: https://regex-generator.olafneumann....ue%27.&flags=i
or on other sites called regex generator.
Set this in the field configuration pattern field. I think,, when it is set it automatically throws an error and does not allow to save the record. If not automatically, you can create an API befor save formula.

[yuri]

I'd recommend to create a custom formula function for this. Then, to check the validity using PHP datetime functions.