如何在javascript中确定日期是否为周末

var dayOfWeek = yourDateObject.getDay();
var isWeekend = (dayOfWeek === 6) || (dayOfWeek  === 0); // 6 = Saturday, 0 = Sunday

var isWeekend = yourDateObject.getDay()%6==0;

又短又甜。

var isWeekend = ([0,6].indexOf(new Date().getDay()) != -1);

在momentjs文档中: weekday 返回的数字取决于区域设置initialWeekDay,因此Monday=0 | Sunday=6

所以我改变逻辑来检查实际的DayString('Sunday')

const weekday = momentObject.format('dddd'); // Monday ... Sunday
const isWeekend = weekday === 'Sunday' || weekday === 'Saturday';

这样您就可以独立于区域设置。

1) 使用 day 获取0-6之间天数的方法:

const day = yourDateObject.day();
// or const day = yourDateObject.get('day');
const isWeekend = (day === 6 || day === 0);    // 6 = Saturday, 0 = Sunday

isoWeekday 获取1-7天的方法:

const day = yourDateObject.isoWeekday();
// or const day = yourDateObject.get('isoWeekday');
const isWeekend = (day === 6 || day === 7);    // 6 = Saturday, 7 = Sunday

var d = new Date();
var n = d.getDay();
 if( n == 6 )
console.log("Its weekend!!");
else
console.log("Its not weekend");

下面是一个我发现更安全的,因为它依赖于 名称 在工作日和 区域设置。

let startDate = start.clone(),
    endDate = end.clone();

let days = 0;
do {
    const weekday = startDate.locale('en').format('dddd'); // Monday ... Sunday
    if (weekday !== 'Sunday' && weekday !== 'Saturday') days++;
} while (startDate.add(1, 'days').diff(endDate) <= 0);

return days;

在当前版本中,您应该使用

    var day = yourDateObject.day();
    var isWeekend = (day === 6) || (day === 0);    // 6 = Saturday, 0 = Sunday

对Date对象使用.getDay()方法来获取日期。

var givenDate = new Date('2020-07-11');
var day = givenDate.getDay();
var isWeekend = (day === 6) || (day === 0) ? 'It's weekend': 'It's working day';
    
console.log(isWeekend);

以下输出一个布尔值,表示日期对象是否在 开放 小时数,不包括周末和夜间 23H00 9H00 ,同时考虑客户端时区偏移。

当然,这不适用于特殊情况,如节假日,但不远;)

let t = new Date(Date.now()) // Example Date object
let zoneshift = t.getTimezoneOffset() / 60
let isopen = ([0,6].indexOf(t.getUTCDay()) === -1) && (23 + zoneshift  < t.getUTCHours() === t.getUTCHours() < 9 + zoneshift)

// Are we open?
console.log(isopen)

<b>We are open all days between 9am and 11pm.<br>
Closing the weekend.</b><br><hr>

Are we open now?

或者,将一周中的某一天作为区域设置 字符串,我们可以使用:

let t = new Date(Date.now()) // Example Date object

console.log(
  new Intl.DateTimeFormat('en-US', { weekday: 'long'}).format(t) ,
  new Intl.DateTimeFormat('fr-FR', { weekday: 'long'}).format(t) ,
  new Intl.DateTimeFormat('ru-RU', { weekday: 'long'}).format(t)
)

当心 new Intl.DateTimeFormat 如果在循环中运行缓慢,则简单关联数组的运行速度要快得多:

console.log(
  ["Sun","Mon","Tue","Wed","Thu","Fri","Sat"][new Date(Date.now()).getDay()]
)

var isWeekend = (yourDateObject.getDay() + 1) % 7 == 0;