timeUtil.js

/*
 * Add pre zero to number which is less than 10, and then return the final string
 * @ num Number 0 
 */
function addPreZero(num) {
    if(arguments.length == 0) num = 0;
    if(num < 10){
        return '0' + num;
    }
    return '' + num;
}

function getTimeNum(date) {
    if(!date || !(date instanceof Date)){
       date = new Date();
    }
    return date.getFullYear()
           + addPreZero((date.getMonth()+1))
           + addPreZero(date.getDate())
           + addPreZero(date.getHours())
           + addPreZero(date.getMinutes())
           + addPreZero(date.getSeconds())
           + date.getMilliseconds();
}