日期的两个案例

定义函数，实现日期格式化 ，传入日期对象，返回日期字符串。例如返回 ”2022 - 09 - 13 16: 33: 08“

        function format(riqi) {
            var year = d.getFullYear() < 10 ? "0" + d.getFullYear() : d.getFullYear();
            //月份从0开始
            var month = d.getMonth() < 10 ? "0" + parseInt(d.getMonth() + 1) : d.getMonth() + 1;
            var date = d.getDate() < 10 ? "0" + d.getDate() : d.getDate();
            var hours = d.getHours() < 10 ? "0" + d.getHours() : d.getHours();
            var minutes = d.getMinutes() < 10 ? "0" + d.getMinutes() : d.getMinutes();
            var seconds = d.getSeconds() < 10 ? "0" + d.getSeconds() : d.getSeconds();
            return year + "-" + month + "-" + date + "" + " " + hours + ":" + minutes + ":" + seconds;
        }
        var d = new Date();
        var xj = format(d);
        console.log(xj);

定义函数，计算任意两个日期的差值，传入两个日期对象；返回 计算结果 ；例如 返回 ”1天2小时3分钟54秒"。

  function differenceValue(date1, date2) {
            //距离时间戳的毫秒数
            var time1 = date1.getTime();
            var time2 = date2.getTime();//差值
            var result = time1 > time2 ? time1 - time2 : time2 - time1;
            console.log(result);

            var day = parseInt(result / (24 * 60 * 60 * 1000));
            var hours = parseInt(result % (24 * 60 * 60 * 1000) / (60 * 60 * 1000));
            var minutes = parseInt(result % (60 * 60 * 1000) / (60 * 1000));
            var seconds = parseInt(result % (60 * 1000) / 1000);
            return "相差" + day + "天" + hours + "小时" + minutes + "分钟" + seconds + "秒";
        }
        var date1 = new Date();
        var date2 = new Date(2022, 8, 13, 8, 12, 45);
        console.log(differenceValue(date1, date2));