validation for EU clock (ie no am/pm) for my own project. Here's the code I added.

At line 1031 jquery.validate.js after the digits test

clock: function(value, element) {
                   return this.optional(element) || /^((0?[1-9]|1[012])(:[0-5]\d){0,2}(\ [AP]M))$|^([01]\d|2[0-3])(:[0-5]\d){0,2}$/.test(value);
           },

At line 755
clock: {clock: true}

At line 265
clock: "Please enter use correct format (eg 12:30).",