Convert timeofday to string to use indexOf
var timeofday = new Date().getHours() + (new Date().getMinutes()) / 60;
console.log(typeof(timeofday)) // for testing will log number
function timeD2C(time) { // Converts 11.5 (decimal) to 11:30 (colon)
var pos = time.indexOf('.');
var hrs = time.substr(1, pos - 1);
var min = (time.substr(pos, 2)) * 60;
if (hrs > 11) {
hrs = (hrs - 12) + ":" + min + " PM";
} else {
hrs += ":" + min + " AM";
}
return hrs;
}
// "" for typecasting to string
document.getElementById("oset").innerHTML = timeD2C(""+timeofday);
Solution 2
use toString() to convert to string
document.getElementById("oset").innerHTML = timeD2C(timeofday.toString());