使用Javascript添加工作日

Question

如何使用javascript添加工作日（即星期一至星期五），在必要時自動添加週末？

因此，如果我今天要加5個工作日（2016年11月22日星期二），我想獲得Tue. 29th Nov. 2016而不是Sun. 27th Nov. 2016。

Answer 1

它可以使用Date的setDate功能（結合getDate）添加到天的日期，即 -

var myDate = new Date(); // Tue 22/11/2016 
myDate.setDate(myDate.getDate() + 3); // Fri 25/11/2016 

所以，一旦你計算的工作日時間內的週末天數您可以將開始日期和所需數量的工作日添加到開始日期以獲取最終日期。

這個功能應該工作，但顯然這不會考慮國家法定節假日 -

function addWorkDays(startDate, days) { 
    // Get the day of the week as a number (0 = Sunday, 1 = Monday, .... 6 = Saturday) 
    var dow = startDate.getDay(); 
    var daysToAdd = parseInt(days); 
    // If the current day is Sunday add one day 
    if (dow == 0) 
     daysToAdd++; 
    // If the start date plus the additional days falls on or after the closest Saturday calculate weekends 
    if (dow + daysToAdd >= 6) { 
     //Subtract days in current working week from work days 
     var remainingWorkDays = daysToAdd - (5 - dow); 
     //Add current working week's weekend 
     daysToAdd += 2; 
     if (remainingWorkDays > 5) { 
      //Add two days for each working week by calculating how many weeks are included 
      daysToAdd += 2 * Math.floor(remainingWorkDays/5); 
      //Exclude final weekend if remainingWorkDays resolves to an exact number of weeks 
      if (remainingWorkDays % 5 == 0) 
       daysToAdd -= 2; 
     } 
    } 
    startDate.setDate(startDate.getDate() + daysToAdd); 
    return startDate; 
} 

//And use it like so (months are zero based) 
var today = new Date(2016, 10, 22); 
today = addWorkDays(today, 5); // Tue Nov 29 2016 00:00:00 GMT+0000 (GMT Standard Time) 

它也可以被添加到Date原型 -

Date.prototype.addWorkDays = function (days) { 
    var dow = this.getDay(); 
    var daysToAdd = parseInt(days); 
    // If the current day is Sunday add one day 
    if (dow == 0) { 
     daysToAdd++; 
    } 
    // If the start date plus the additional days falls on or after the closest Saturday calculate weekends 
    if (dow + daysToAdd >= 6) { 
     //Subtract days in current working week from work days 
     var remainingWorkDays = daysToAdd - (5 - dow); 
     //Add current working week's weekend 
     daysToAdd += 2; 
     if (remainingWorkDays > 5) { 
      //Add two days for each working week by calculating how many weeks are included 
      daysToAdd += 2 * Math.floor(remainingWorkDays/5); 
      //Exclude final weekend if the remainingWorkDays resolves to an exact number of weeks 
      if (remainingWorkDays % 5 == 0) 
       daysToAdd -= 2; 
     } 
    } 
    this.setDate(this.getDate() + daysToAdd); 
}; 

//And use it like so (months are zero based) 
var today = new Date(2016, 10, 22) 
today.addWorkDays(5); // Tue Nov 29 2016 00:00:00 GMT+0000 (GMT Standard Time) 

Answer 2

我認爲你可以使用moment-business-days。

實施例：

// 22-11-2016 is Tuesday, DD-MM-YYYY is the format 
moment('22-11-2016', 'DD-MM-YYYY').businessAdd(5)._d // Tue Nov 29 2016 00:00:00 GMT-0600 (CST)