Javascript如何在使用时区时通过getDay验证日期

Question

我正在尝试验证一周中的某一天是否等于星期三 (3)，如果我按照以下步骤操作，则效果很好。

var today = new Date();

if (today.getDay() == 3) {
  alert('Today is Wednesday');
} else {
	alert('Today is not Wednesday');
}

但我无法对时区执行相同的操作。

var todayNY = new Date().toLocaleString("en-US", {timeZone: "America/New_York"});

if (todayNY.getDay() == 3) {
  alert('Today is Wednesday in New York');
} else {
	alert('Today is not Wednesday in New York');
}

Answer 1

new Date().toLocaleString()根据特定于语言的约定返回表示给定日期的字符串。所以可以这样做

var todayNY = new Date();

var dayName = todayNY.toLocaleString("en-US", {
    timeZone: "America/New_York",
    weekday: 'long'
})

if (dayName == 'Wednesday') { // or some other day
    alert('Today is Wednesday in New York');
} else {
    alert('Today is not Wednesday in New York');
}