【原创】js返回自定义日期格式（今天、昨天、前天）

给定long型时间戳，js判断改时间节点，返回今天、昨天、前天或自定义日期形式：

//扩展Date的format方法
    Date.prototype.format = function (format) {
        var o = {
            "M+": this.getMonth() + 1,
            "d+": this.getDate(),
            "h+": this.getHours(),
            "m+": this.getMinutes(),
            "s+": this.getSeconds(),
            "q+": Math.floor((this.getMonth() + 3) / 3),
            "S": this.getMilliseconds()
        }
        if (/(y+)/.test(format)) {
            format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
        }
        for (var k in o) {
            if (new RegExp("(" + k + ")").test(format)) {
                format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
            }
        }
        return format;
    };
    /*  转换long值为日期字符串
     *  l long值
     *  pattern 格式字符串,例如：yyyy-MM-dd hh:mm:ss
     */
    function getFormatDateByLong(l, pattern) {
        return getFormatDate(new Date(l), pattern);
    };
    function getFormatDate(date, pattern) {
        if (date == undefined) {
            date = new Date();
        }
        if (pattern == undefined || pattern == "") {
            pattern = "yyyy-MM-dd hh:mm:ss";
        }
        return date.format(pattern);
    };

    //时间格式转换
    function returnDiyDate(date) {
        //date = parseInt(date);  //强转整型
        var tDate = getFormatDate(new Date(), "yyyy/MM/dd");  //当前凌晨时间(string)
        var tTime = new Date(tDate).getTime(); //当前凌晨时间(long)
        var eTime = 24 * 60 * 60 * 1000;  //一天时间(long)
        var yTime = tTime - eTime;  //昨天凌晨时间(long)
        var byTime = tTime - 2 * eTime;  //前天凌晨时间(long)
        var formatDate = getFormatDateByLong(date, "hh:mm");    //转成时分格式
        if (date >= tTime) {
            //今天
            var result = formatDate;
        } else if (date < tTime && date >= yTime) {
            //昨天
            var result = "昨天 " + formatDate;
        } else if (date < yTime && date >= byTime) {
            //前天
            var result = "前天 " + formatDate;
        } else {
            //前天之前
            var result = getFormatDateByLong(date, "MM-dd hh:mm");
        }
        return result;
    };

调用示例：

var l = 1405042645000;

returnDiyDate(l);