Validate a HH:MM time

Question

This is my javascript sample. How can it be improvised?

function a(id) 
{
    var n=document.getElementById(id);
    var re=/^[0-9]:[0-9] [to] [0-9]:[0-9]*$/;

    if(re.test(n.value))
    {
        n.style.backgroundColor="#52F40C";
    }
    else
    {
        window.alert("Invalid Entry");
        n.style.backgroundColor="#F40C0C";
        n.focus();
        n.value="";
    }
}

I wanna validate user input which should be for example 10:30 to 12:30. I'm a fresher please suggest me.

Answer 1

Use this regex for time format hh:mm

^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$

I have just placed the time format.Try to edit this for your requirement.