function convertTime12To24(time) {
    var hours   = Number(time.match(/^(\d+)/)[1]);
    var minutes = Number(time.match(/:(\d+)/)[1]);
    var AMPM    = time.match(/\s(.*)$/)[1];
    if (AMPM === "PM" && hours < 12) hours = hours + 12;
    if (AMPM === "AM" && hours === 12) hours = hours - 12;
    var sHours   = hours.toString();
    var sMinutes = minutes.toString();
    if (hours < 10) sHours = "0" + sHours;
    if (minutes < 10) sMinutes = "0" + sMinutes;
    return (sHours + ":" + sMinutes);
}