JS获得一个月中的周数 [英] moment JS get number of weeks in a month

问题描述

我正在尝试使用js时刻来计算一个月中的星期数.但是在2015年5月和2015年8月的几个月中，我得到了错误的结果.

I am trying to calculate number of weeks in a month using moment js. But I am getting wrong results for some months like May 2015 and August 2015.

我正在使用此代码.

var start = moment().startOf('month').format('DD');
var end = moment().endOf('month').format('DD');
var weeks = (end-start+1)/7;
weeks = Math.ceil(weeks);

JS时刻中是否有任何预构建的方法可以获取星期数.

Is there any prebuilt method in moment JS for getting number of weeks.

推荐答案

我创建了要点，该要点可以找到给定月份和年份中的所有星期.通过计算calendar的长度，您将知道星期数.

I have created this gist that finds all the weeks in a given month and year. By calculated the length of calendar, you will know the number of weeks.

https://gist.github.com/guillaumepiot/095b5e02b4ca22680a50

# year and month are variables
year = 2015
month = 7 # August (0 indexed)
startDate = moment([year, month])

# Get the first and last day of the month
firstDay = moment(startDate).startOf('month')
endDay = moment(startDate).endOf('month')

# Create a range for the month we can iterate through
monthRange = moment.range(firstDay, endDay)

# Get all the weeks during the current month
weeks = []
monthRange.by('days', (moment)->
    if moment.week() not in weeks
        weeks.push(moment.week())
)

# Create a range for each week
calendar = []
for week in weeks
    # Create a range for that week between 1st and 7th day
    firstWeekDay = moment().week(week).day(1)
    lastWeekDay = moment().week(week).day(7)
    weekRange = moment.range(firstWeekDay, lastWeekDay)

    # Add to the calendar
    calendar.push(weekRange)

console.log calendar

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