js时间(Date)处理

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js时间(Date)处理

正文

Date转字符串

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function getDateStr() {
    let date = new Date();
    let year = date.getFullYear();
    let month = date.getMonth() + 1;
    let day = date.getDate();
    let hour = date.getHours();
    let minute = date.getMinutes();
    let sec = date.getSeconds();
    month = month < 10 ? "0" + month : month;
    day = day < 10 ? "0" + day : day;
    hour = hour < 10 ? "0" + hour : hour;
    minute = minute < 10 ? "0" + minute : minute;
    sec = sec < 10 ? "0" + sec : sec;
    return year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + sec;
}
console.info(getDateStr());

通用日期格式化

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export function dateFormat(date, format = "yyyy-MM-dd hh:mm:ss") {
  if (date !== "Invalid Date") {
    var o = {
      "M+": date.getMonth() + 1, // month
      "d+": date.getDate(), // day
      "h+": date.getHours(), // hour
      "m+": date.getMinutes(), // minute
      "s+": date.getSeconds(), // second
      "q+": Math.floor((date.getMonth() + 3) / 3), // quarter
      S: date.getMilliseconds() // millisecond
    };
    if (/(y+)/.test(format)) {
      format = format.replace(
        RegExp.$1,
        (date.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;
  }
  return "";
}

时间戳转Date

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let timeUinx = 1629861058;
let date = new Date(timeUinx * 1000);
console.info(date.toLocaleString());

结果如下

2021-8-25 11:10:58 AM

Date转时间戳

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let date = new Date();
let timeUnix1 = date.getTime();
let timeUnix2 = date.valueOf();
let timeUnix3 = Date.parse(date);
console.info(timeUnix1);
console.info(timeUnix2);
console.info(timeUnix3);

结果如下

1629863671426
1629863671426
1629863671000

这三种都是13位的，但是前两种精确到毫秒，最后一个精确到秒

获取10位的时间戳

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let date = new Date();
let timeUnix1 = parseInt(date.getTime() / 1000 + "");
let timeUnix2 = parseInt(date.valueOf() / 1000 + "");
let timeUnix3 = parseInt(Date.parse(date) / 1000 + "");
console.info(timeUnix1);
console.info(timeUnix2);
console.info(timeUnix3);