如何使用Moment JS计算范围之间的给定工作日数? [英] How do I calculate number of given weekday between range using Moment JS?
问题描述
如何使用Moment JS和jQuery找出给定工作日中的几个(例如:星期二)在日期范围内?
我可以使用差值找到天数: http://momentjs.com/docs/#/displaying/difference/ >
我知道开始和结束日期,所以我觉得应该可以吗?
示例:3月1日至3月25日之间有几个星期二?
我想出了以下功能,该功能似乎适用于我尝试过的少数测试用例:
function weekdaysBetween(d1, d2, isoWeekday) {
// ensure we have valid moment instances
d1 = moment(d1);
d2 = moment(d2);
// figure out how many days to advance to get to the next
// specified weekday (might be 0 if d1 is already the
// specified weekday).
var daysToAdd = ((7 + isoWeekday) - d1.isoWeekday()) % 7;
var nextTuesday = d1.clone().add(daysToAdd, 'days');
// if we are already passed the end date, there must not
// be any of that day in the given period.
if (nextTuesday.isAfter(d2)) {
return 0;
}
// otherwise, just return the whole number of weeks
// difference plus one for the day we already advanced to
var weeksBetween = d2.diff(nextTuesday, 'weeks');
return weeksBetween + 1;
}
您将当天的 isoWeekday
值传递您正在尝试数数.例如在星期二,请输入2
.
示例调用:
var d1 = moment('2015-03-01');
var d2 = moment('2015-03-25');
console.log('result:', weekdaysBetween(d1, d2, 2)); // => result: 4
但是,在完全信任它之前,您应该添加自己的测试.
How do I find out how many of a given weekday (ex: Tuesdays) are in a date range using Moment JS and jQuery?
I can find the number of days using Difference: http://momentjs.com/docs/#/displaying/difference/
And I know the start and end date, so I feel like it should be possible?
Example: How many Tuesdays are there between March 1st and March 25th?
I came up with the following function that seems to work for the given handful of test cases I tried:
function weekdaysBetween(d1, d2, isoWeekday) {
// ensure we have valid moment instances
d1 = moment(d1);
d2 = moment(d2);
// figure out how many days to advance to get to the next
// specified weekday (might be 0 if d1 is already the
// specified weekday).
var daysToAdd = ((7 + isoWeekday) - d1.isoWeekday()) % 7;
var nextTuesday = d1.clone().add(daysToAdd, 'days');
// if we are already passed the end date, there must not
// be any of that day in the given period.
if (nextTuesday.isAfter(d2)) {
return 0;
}
// otherwise, just return the whole number of weeks
// difference plus one for the day we already advanced to
var weeksBetween = d2.diff(nextTuesday, 'weeks');
return weeksBetween + 1;
}
You pass in the isoWeekday
value for the day you are trying to count. e.g. for Tuesday, pass in 2
.
Sample invocation:
var d1 = moment('2015-03-01');
var d2 = moment('2015-03-25');
console.log('result:', weekdaysBetween(d1, d2, 2)); // => result: 4
Wolfram Alpha gives the same result.
You should add your own tests before trusting this completely, though.
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