javascript - 创建时间戳记中的日期数组，增量为 1 年

Question

假设我将最小日期拉为1420070400000，即2015-01-01 00:00:00，最大日期为1575158400000这是2019-12-01 00:00:00。

然后，我尝试为这两个日期之间的每个月创建一个时间戳数组，如下所示:

var offset = 5*60*60000

dtMin = new Date(+1420070400000 + offset);
dtMax = new Date(+1575158400000 + offset);

console.log("dtmin: ", dtMin);
console.log("dtmax: ", dtMax);

while (dtMin <= dtMax) {

  dtRng.push((dtMin.getTime() - offset).toString());

  dtMin = new Date(new Date(dtMin).setMonth(dtMin.getMonth()+1));

}

console.log("dt rng:", JSON.stringify(dtRng));

然后将其作为数组返回:

["1420070400000","1422748800000","1425168000000","1427842800000","1430434800000","1433113200000","1435705200000","1438383600000","1441062000000","1443654000000","1446332400000","1448928000000","1451606400000","1454284800000","1456790400000","1459465200000","1462057200000","1464735600000","1467327600000","1470006000000","1472684400000","1475276400000","1477954800000","1480550400000","1483228800000","1485907200000","1488326400000","1491001200000","1493593200000","1496271600000","1498863600000","1501542000000","1504220400000","1506812400000","1509490800000","1512086400000","1514764800000","1517443200000","1519862400000","1522537200000","1525129200000","1527807600000","1530399600000","1533078000000","1535756400000","1538348400000","1541026800000","1543622400000","1546300800000","1548979200000","1551398400000","1554073200000","1556665200000","1559343600000","1561935600000","1564614000000","1567292400000","1569884400000","1572562800000","1575158400000"]

但有时它会拉回 31 天或第 30 天，例如:

Epoch date  Human readable date (GMT) 
1420070400  2015-01-01 00:00:00
1422748800  2015-02-01 00:00:00
1425168000  2015-03-01 00:00:00
1427842800  2015-03-31 23:00:00
1430434800  2015-04-30 23:00:00
1433113200  2015-05-31 23:00:00
1435705200  2015-06-30 23:00:00
1438383600  2015-07-31 23:00:00

如果我按月递增，为什么会这样做？

此外，我的 minDate 和 maxDate 可能会有所不同...例如，minDate 可能是 1464739200000(星期三，2016 年 6 月 1 日 00:00:00)，最大日期可能是 1488326400000(星期三，2017 年 3 月 1 日 00:00): 00)...

另外，为什么它在前 3 个月准确地做到了这一点，而之后的几个月则不然......行为看起来很奇怪......

---编辑-----

尝试使用 momentjs 并将 while 部分更改为:

   while (dtMin <= dtMax) {

       dtRng.push(dtMin);

       dtMin = moment(dtMin).add(1, 'months').toDate();
       console.log("dtmin: ", dtMin);
   }

这里发生了一些奇怪的事情...控制台打印出以下内容:

Sun Feb 01 2015 00:00:00 GMT-0500 (EST)
Sun Mar 01 2015 00:00:00 GMT-0500 (EST)
Wed Apr 01 2015 00:00:00 GMT-0400 (EDT)
Fri May 01 2015 00:00:00 GMT-0400 (EDT)
Mon Jun 01 2015 00:00:00 GMT-0400 (EDT)
Wed Jul 01 2015 00:00:00 GMT-0400 (EDT)
Sat Aug 01 2015 00:00:00 GMT-0400 (EDT)
Tue Sep 01 2015 00:00:00 GMT-0400 (EDT)

但是推送到 dtRng 的时间戳看起来像这样，请注意第 30 天、第 31 天和 23 小时:

Epoch date  Human readable date (GMT) 
1422748800  2015-02-01 00:00:00
1425168000  2015-03-01 00:00:00
1427842800  2015-03-31 23:00:00
1430434800  2015-04-30 23:00:00
1433113200  2015-05-31 23:00:00
1435705200  2015-06-30 23:00:00
1438383600  2015-07-31 23:00:00
1441062000  2015-08-31 23:00:00
1443654000  2015-09-30 23:00:00

它应该返回这个:

Epoch date  Human readable date (GMT) 
1422748800  2015-02-01 00:00:00
1425168000  2015-03-01 00:00:00
1427846400  2015-04-01 00:00:00
1430438400  2015-05-01 00:00:00
1433116800  2015-06-01 00:00:00
1435708800  2015-07-01 00:00:00
1438387200  2015-08-01 00:00:00
1441065600  2015-09-01 00:00:00

Answer 1

从最新的更新来看，好像是you've run into a timezone issue从东部标准时间 (EST) 转换为东部夏令时间 (EDT) 时，您会损失(或增加!？)一个小时，这解释了为什么您在某些日期打印 23:00:00。

同时dealing with timezones可以是a bit tricky ，对于这个特定问题，我建议使用更简单的方法，使用 Date.UTC 创建 UTC 中的所有日期。功能。一个简单的循环是遍历所有年份的所有月份:

for(var year = 2015; year < 2020; year++)
    for(var month = 0; month < 12; month++)
        dtRng.push(new Date(Date.UTC(year, month, 1, 00, 00, 00)));

输出console.log(JSON.stringify(dtRng))似乎给出了正确的结果:

"2015-02-01T00:00:00.000Z",
"2015-03-01T00:00:00.000Z",
"2015-04-01T00:00:00.000Z",
"2015-05-01T00:00:00.000Z",
"2015-06-01T00:00:00.000Z",
....

修改是分三部分循环开始和结束日期:

• 对于第一年，循环起始月份至 12。
• 对于除最后一年之外的所有年份，每年循环 1 - 12 个月。
• 对于去年，从 1 循环到最后一个月。

<小时/>

以下代码以 YYYY/MM/DD 格式演示了日期范围(2015/03/01 至 2019/09/01) 的情况。

// Initialize the date range.
var startYear = 2015, startMonth = 03,
      endYear = 2019,   endMonth = 09;

// Loop through the years.
for(var year = startYear; year <= endYear; year++) {
    var currStartMonth = 1, currEndMonth = 12;

    // If it's the first year, skip the months before the range.
    if (year === startYear) currStartMonth = startMonth;

    // If it's the last year, skip the months after the range.
    // Note that this also gracefully handles the case when,
    // startYear === endYear.
    if (year === endYear)     currEndMonth = endMonth;

    // Loop through the months and add it to the dates array.
    // '- 1' because of 0-indexing of month.
    for (var month = currStartMonth - 1; month < currEndMonth; month++) 
        dtRng.push(new Date(Date.UTC(year, month, 1, 00, 00, 00)));
}