在 JavaScript 中检查日期
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6800253/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Check date in JavaScript
提问by js-coder
I get three variables through a user input, that contain the year of a date, the month and the day. I've already checked if the month var is between 1–12 and so on.
我通过用户输入获得三个变量，其中包含日期的年份、月份和日期。我已经检查过月份变量是否在 1-12 之间等等。
Now I want to check if it's a real date and not a date that doesn't exist like 31–06–2011.
现在我想检查它是否是真实日期，而不是像 31–06–2011 这样不存在的日期。
My first idea was to make a new Date instance:
我的第一个想法是创建一个新的 Date 实例：
var year = 2011;
var month = 5; // five because the months start with 0 in JavaScript - June
var day = 31;
var myDate = new Date(2011,5,31);
console.log(myDate);
But myDate doesn't return false, because it's not a valid date. Instead it returns 'Fri Jul 01 2011 [...]'.
但 myDate 不会返回 false，因为它不是有效日期。相反，它返回“Fri Jul 01 2011 [...]”。
Any ideas how I can check for an invalid date?
任何想法如何检查无效日期？
回答by Gaurav
Try this:
试试这个：
if ((myDate.getMonth()+1!=month)||(myDate.getDate()!=day)||(myDate.getFullYear()!=year))
alert("Date Invalid.");
回答by Sergey Metlov
if ((myDate.getDate() != day) ||
(myDate.getMonth() != month - 1) ||
(myDate.getFullYear() != year))
{
return false;
}
JavaScript just converts entered in Dateconstructor month, year, day, etc.. in simple int value (milliseconds) and then formats it to represent in string format. You can create new Date(2011, 100, 100)and everythig will ok :)
JavaScript的只是转换在进入Date构造函数month，year，day，等简单的int值（毫秒）..然后格式化它以字符串格式表示。你可以创建new Date(2011, 100, 100)，一切都会好的:)
回答by dbb
You could possibly do what you do now and construct a new Date object and then afterwards check the value of myDate.getFullYear(), myDate.getMonth(), myDate.getDate(), to ensure that those values match the input values. Keep in mind that getMonth() and getDate() are 0 indexed, so January is month 0 and December is month 11.
您可以按照现在的操作构建一个新的 Date 对象，然后检查 myDate.getFullYear()、myDate.getMonth()、myDate.getDate() 的值，以确保这些值与输入值匹配。请记住，getMonth() 和 getDate() 索引为 0，因此一月是 0 月，十二月是 11 月。
Here's an example:
下面是一个例子：
function isValidDate(year, month, day) {
var d = new Date(year, month, day);
return d.getFullYear() === year && d.getMonth() === month && d.getDate() === day;
}
console.log(isValidDate(2011,5,31));
console.log(isValidDate(2011,5,30));
回答by neoerol
I think this way true.
我认为这种方式是正确的。
function isValidDate(year, month, day) {
var d = new Date(year, month, day);
if(month == 12){
year = parseInt(year)*1+1*1;
month = 0;
}
day = parseInt(day);
month = parseInt(month);
year = parseInt(year);
if(month === 2 && day > 29){
return false;
}
return d.getFullYear() === year && d.getMonth() === month && d.getDate() === day;
}
