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Conversion of 24 hours (format) time to 12 hours (format) time and vice versa using Javascript 


function ConvertTo24HoursFormat(timeIn12HoursFormat){
        var tempDate = new Date("19/01/2012 " + timeIn12HoursFormat.toString());

        if (!IsValid12HoursTimeFormat(timeIn12HoursFormat) || tempDate == "Invalid Date") {
            alert("Invalid time, please check...");
            return;
        }

        return tempDate.toTimeString().split(":")[0] + ":" + tempDate.toTimeString().split(":")[1];
    }

function ConvertTo12HoursFormat(timeIn24HoursFormat) {
        var tempDate = new Date("19/01/2012 " + timeIn24HoursFormat.toString());

        if (!IsValid24HoursTimeFormat(timeIn24HoursFormat) || tempDate == "Invalid Date") {
            alert("Invalid time, please check...");
            return;
        }

        var parsedTime = parseInt(GetNumericValue(tempDate.toTimeString().split(":")[0] + ":" + tempDate.toTimeString().split(":")[1]));
        var minutes = tempDate.toTimeString().split(":")[1];

        if (parsedTime > 1259) {
            parsedTime = parsedTime - 1200;
            var timeString = String(parsedTime),
                hours = timeString.substring(0, timeString.length - 2),
                minutes = timeString.substring(timeString.length - 2, timeString.length),
                suffix = " P.M.";

            return hours + ":" + minutes + suffix;
        }
        else {
            var timeString = String(parsedTime),
                hours = timeString.substring(0, timeString.length - 2),
                suffix = " A.M.";
            
            if (hours == "12") suffix = " P.M.";

            if (hours == "") hours = "12";

            return hours + ":" + minutes + suffix;
        }
    }

function GetNumericValue(alphaNumeric) {
        var valid = "0123456789",
            output = '';

        for (var i = 0; i < alphaNumeric.length; i++)
            if (valid.indexOf(alphaNumeric.charAt(i)) != -1)
                output += alphaNumeric.charAt(i)

        return output;
    }
IsValid12HoursTimeFormat() and IsValid24HoursTimeFormat() are custom 
validation methods in which I used regex
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