Validating time in javascript

Otherwise you can end up with values in the database that have no relation to reality.In this example, the date fields will only accept input that matches the pattern 'dd/mm/yyyy' (this could just as easily be changed to 'yyyy-mm-dd' or 'mm/dd/yyyy').It requires am/pm when the hour is less than or equal to 12.

If not, the input is compared to the regular expression.If you imagine form as a dialog between your website and your user, the messages play an important role.Don’t leave it to the auto-generated default messages.If they don't properly escape when inserting into SQL, any name with an apostrophe (which your original question already recognizes as necessary) opens you up to security vulnerabilities.Imagine trying to authenticate a user nameed "Foo'or True Or'foo" — no "dangerous" characters, but there goes your login scheme.This function verifies that a string is a valid time, in the form hh:mm:ss am/pm, where seconds are optional.It accepts military time (hour between 0 and 23) as long as am/pm isn't specified.If you skip the message for a validation, the default message is displayed.See a complete demo @Codepen The messages parameter is optional.The expressions use a pre-defined class is returned which enables the form to be submitted.This routine DOES NOT check that the date or time input values are valid, just that they match the required format (d/m/y and h:m). Once you're in control of the input format, it's a lot easier to check that the values are actually valid.