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  function convert12to24(timeStr)
{
    var meridian = timeStr.substr(timeStr.length-2).toLowerCase();
    var hours    = timeStr.substring(0, timeStr.indexOf(':'));
    var minutes  = timeStr.substring(timeStr.indexOf(':')+1, timeStr.indexOf(' '));
    if (meridian=='pm')
    {
        hours = (hours=='12') ? '00' : parseInt(hours)+12 ;
    }
    else if(hours.length<2)
    {
        hours = '0' + hours;
    }
    return hours+':'+minutes;
}