javascript - 如何使用 moment.js 和 moment timezone 确定商店是打开还是关闭？

Question

我在我的网站中使用 momentjs 来根据特定商店位置的选定开门、关门时间和时区来确定商店是仍在营业还是关门。我制作的函数在某些时间范围内有效，但在某些时间范围内无效。

JS 库

/moment.js
/moment-timezone-with-data-10-year-range.js

我的示例代码

 function isOpen(openTime, closeTime, timezone){
  var  status = "closed";
  if(openTime != "24HR"){
    const  now = moment().tz(timezone);
    const  storeOpenTime = moment.tz(openTime, "h:mmA", timezone);
    const  storeCloseTime = moment.tz(closeTime, "h:mmA", timezone);
    /* const  storeOpenTime = moment.tz(Date.now(Date(openTime)), "h:mmA", timezone);
    const  storeCloseTime = moment.tz(Date.now(Date(closeTime)), "h:mmA", timezone);*/
    const  check = now.isBetween(storeOpenTime, storeCloseTime);
    if(check || check == true){
      status = "open";
    }
  }else{
    status = "open";
  }
  return status;
}

假设马来西亚吉隆坡的当前时间是晚上 11:34，我运行以下代码

 isOpen("8:00AM", "12:20AM", "Asia/Kuala_Lumpur") 
 returned output = closed

上面代码的预期输出是open，但是如果在马来西亚吉隆坡的当前时间是晚上 11:34 时运行下面的代码。

isOpen("8:00AM", "10:20PM", "Asia/Kuala_Lumpur")
returned output = closed

上面的输出是正确的。

我的问题是如何使用 momentjs 检查打开和关闭之间的时间是否已使用国家时区？

Answer 1

这是您的代码更正和注释:

function isOpen(openTime, closeTime, timezone) {

  // handle special case
  if (openTime === "24HR") {
    return "open";
  }

  // get the current date and time in the given time zone
  const now = moment.tz(timezone);

  // Get the exact open and close times on that date in the given time zone
  // See https://github.com/moment/moment-timezone/issues/119
  const date = now.format("YYYY-MM-DD");
  const storeOpenTime = moment.tz(date + ' ' + openTime, "YYYY-MM-DD h:mmA", timezone);
  const storeCloseTime = moment.tz(date + ' ' + closeTime, "YYYY-MM-DD h:mmA", timezone);

  let check;
  if (storeCloseTime.isBefore(storeOpenTime)) {
    // Handle ranges that span over midnight
    check = now.isAfter(storeOpenTime) || now.isBefore(storeCloseTime);
  } else {
    // Normal range check using an inclusive start time and exclusive end time
    check = now.isBetween(storeOpenTime, storeCloseTime, null, '[)');
  }

  return check ? "open" : "closed";
}

// Testing
const zone = "Asia/Kuala_Lumpur";
console.log("now", moment.tz(zone).format("h:mmA"));
console.log("24HR", isOpen("24HR", undefined, zone));
console.log("2:00AM-8:00AM", isOpen("2:00AM", "8:00AM", zone));
console.log("8:00AM-2:00PM", isOpen("8:00AM", "2:00PM", zone));
console.log("2:00PM-8:00PM", isOpen("2:00PM", "8:00PM", zone));
console.log("8:00PM-2:00AM", isOpen("8:00PM", "2:00AM", zone));

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.27/moment-timezone-with-data-10-year-range.min.js"></script>

您遇到的主要问题是您必须解决 issue #119 中描述的错误，即在特定时区解析时间时，Moment 错误地应用了 UTC 日期而不是特定于 tz 的本地日期。

其次，您还需要通过检查打开/关闭时刻是否乱序来处理时间范围跨越午夜的情况。如果是，则需要以不同的方式进行比较 - 通过检查当前时间是在打开之后还是关闭之前。