js时间格式化

1 当给定时间为1997-10-10时转化为毫秒值，需要先提取这样的参数，在使用getTime

2 当给定的值为毫秒值 转化为日期显示时 

  function formatBeginTime(time){
    var year = time.getFullYear();
    var mouth = time.getMonth();//比实际只小，此处若加1下面新建时间将对应不上
    var day = time.getDate();
    var temp = new Date(year,mouth,day,00,00,00);
    return temp;
  }

3 带指定格式的日期显示：使用formatDate（date，‘yyyy-MM-dd hh:mm:ss’）

function formatDate (date, fmt) {
    if(!date){
        return '';
    }
    if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
    }
    let o = {
        'M+': date.getMonth() + 1,
        'd+': date.getDate(),
        'h+': date.getHours(),
        'm+': date.getMinutes(),
        's+': date.getSeconds()
    }
    for (let k in o) {
        if (new RegExp(`(${k})`).test(fmt)) {
            let str = o[k] + ''
            fmt = fmt.replace(RegExp.$1, RegExp.$1.length === 1 ? str : padLeftZero(str))
        }
    }
    return fmt
}

function padLeftZero (str) {
    return ('00' + str).substr(str.length)
}

　　

4 格式化时间，当小于一天时小时小时及分钟，大于时显示日期

function convertTime(tem){
    var curDate = new Date();
    var numEng = ['one','two','three','four','five','six','seven','eight','nine','ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen','twenty','twenty-one','twenty-two','twenty-three','twenty-four','twenty-five','twenty-six','twenty-seven','twenty-eight','twenty-nine','thirty','thirty-one','thirty-two','thirty-three','thirty-four','thirty-five','thirty-six','thirty-seven','thirty-eight','thirty-nine','forty','forty-one ','forty-two','forty-three',' forty-four','forty-five',' forty-six',' forty-seven',' forty-eight',' forty-nine',' fifty','fifty-one','fifty-two','fifty-three','fifty-four ','fifty-five','fifty-six','fifty-seven','fifty-eight','fifty-nine','sixty'];
    var diff =  curDate.getTime()-tem;
    if(diff<3600000){
        var minute = Math.ceil(diff/60000);
        minute = numEng[minute-1];
        tem = minute+'&nbsp;minutes ago';
    }else if(diff<86400000){
        var hour = Math.ceil(diff/3600000);
        hour = numEng[hour-1]
        tem = hour+'&nbsp;hours ago';
    }else{
        var date = dateFormat(tem);
        tem = date;
    }
    return tem;
}
function dateFormat(time){
    var time =  new Date(time);
    var year = time.getFullYear();
    var month = time.getMonth()+1;
    var day = time.getDate();
    function zeroFill(t){
        if(t<10){
            return '0'+t;
        }else{
            return t;
        }

    }
    return year+"-"+zeroFill(month)+"-"+zeroFill(day);
}