如何获取日期和 weekofyear、year 元组之间的周数

发布于 2025-01-18 07:28:37 字数 801 浏览 0 评论 0原文

如何获得给定日期和（周年元，年）元组之间的几周数？最好使用MOMMJS。

function getWeeksBetweenStartDate(weekOfYear, year)
  const date = moment().set({
    year: 1982,
    month: 3,
    day: 18,
    hour: 0,
    minute: 0,
    second: 0,
  });
  const weeksSinceDate =
    moment()
      .year(year)
      .isoWeek(weekOfYear)
      .day(0)
      .hour(0)
      .minute(0)
      .subtract(date)
      .weeks() ;
}

function getWeeks(date) {
  return getWeeksBetweenStartDate(date.isoWeeks(), date.year());
}

  getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 21,
      hour: 0,
    })
  )  // returns 0

  getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 23,
      hour: 0,
      minute: 0,
    })
  ) // returns 1

即使两个示例日期是同一周的一部分，但返回了不同的周三角洲。

原文

How do I get the number of weeks between a given date and (weekofyear, year) tuple? Preferably using momentjs.

function getWeeksBetweenStartDate(weekOfYear, year)
  const date = moment().set({
    year: 1982,
    month: 3,
    day: 18,
    hour: 0,
    minute: 0,
    second: 0,
  });
  const weeksSinceDate =
    moment()
      .year(year)
      .isoWeek(weekOfYear)
      .day(0)
      .hour(0)
      .minute(0)
      .subtract(date)
      .weeks() ;
}

function getWeeks(date) {
  return getWeeksBetweenStartDate(date.isoWeeks(), date.year());
}

  getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 21,
      hour: 0,
    })
  )  // returns 0

  getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 23,
      hour: 0,
      minute: 0,
    })
  ) // returns 1

Even though the two example dates are part of same week, a different week delta is returned.

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行至春深 2025-01-25 07:28:37

我认为代码中有几个错误：

首先，你不应该在getWeeksBetweenStartDate中这样做.subtract(date)，相减后，日期将变成1970年附近（ UTC 纪元）。相反，您
不应该使用 isoWeeks 方法，因为在 isoWeeks 中，星期一是一周的开始。
最好在开始时设置 moment.locale('us')，以确保一周始终从星期日开始。

以下可能是您期望的正确代码：


moment.locale("us")
 
function getWeeksBetweenStartDate(date) {
  const weeksBegin = moment().set({
    year: 1982,
    month: 3,
    day: 18,
    hour: 0,
    minute: 0,
    second: 0,
  }).weeks();
  const weeksEnd = date.weeks();
  return weeksEnd - weeksBegin;
}

function getWeeks(date) {
  return getWeeksBetweenStartDate(date);
}

console.log(getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 21,
      hour: 0,
    })
    )  // returns 0
    ,
    getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 23,
      hour: 0,
      minute: 0,
    })
    ) // returns 1
)

There are several mistakes in the code I think:

First, you should not do that .subtract(date) in getWeeksBetweenStartDate, after subtraction, the date will become nearby 1970 (The UTC epoch). Instead, you should
You should not use the isoWeeks method, because in isoWeeks, Monday is the beginning of a week.
Had Better set moment.locale('us') at the beginning, to ensure a week always begins at Sunday.

The following maybe the correct code you expect:


moment.locale("us")
 
function getWeeksBetweenStartDate(date) {
  const weeksBegin = moment().set({
    year: 1982,
    month: 3,
    day: 18,
    hour: 0,
    minute: 0,
    second: 0,
  }).weeks();
  const weeksEnd = date.weeks();
  return weeksEnd - weeksBegin;
}

function getWeeks(date) {
  return getWeeksBetweenStartDate(date);
}

console.log(getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 21,
      hour: 0,
    })
    )  // returns 0
    ,
    getWeeks(
    moment().set({
      year: 1982,
      month: 3,
      day: 23,
      hour: 0,
      minute: 0,
    })
    ) // returns 1
)

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