Question

当我将年，月，日作为字符串传递给moment.js日期构造函数以获取该月的最后一天时，它返回＆＃34;无效日期＆＃34;三月和八月：

moment(["2022","0","31"]).toISOString()
"2022-01-31T06:00:00.000Z"
moment(["2022","1","28"]).toISOString()
"2022-02-28T06:00:00.000Z"

//March
moment(["2022","2","31"]).toISOString()
"Invalid date"

moment(["2022","3","30"]).toISOString()
"2022-04-30T05:00:00.000Z"
moment(["2022","4","31"]).toISOString()
"2022-05-31T05:00:00.000Z"
moment(["2022","5","30"]).toISOString()
"2022-06-30T05:00:00.000Z"
moment(["2022","6","31"]).toISOString()
"2022-07-31T05:00:00.000Z"

//August
moment(["2022","7","31"]).toISOString()
"Invalid date"

moment(["2022","8","30"]).toISOString()
"2022-09-30T05:00:00.000Z"
moment(["2022","9","31"]).toISOString()
"2022-10-31T05:00:00.000Z"
moment(["2022","10","30"]).toISOString()
"2022-11-30T06:00:00.000Z"
moment(["2022","11","31"]).toISOString()
"2022-12-31T06:00:00.000Z"

但是，当我为Month参数指定一个整数时，这些日期起作用：

//March
moment(["2022",2,"31"]).toISOString()
"2022-03-31T05:00:00.000Z"

//August
moment(["2022",7,"31"]).toISOString()
"2022-08-31T05:00:00.000Z"

我想知道为什么当我将Month参数作为字符串与整数传递时会发生这种情况？

Answer 1

原来升级到最新版本的moment.js修复了它。

旧破例（v2.7.0）： https://jsfiddle.net/1Lwauz1t/1/

最新版本工作示例（v2.18.1）： https://jsfiddle.net/dsadkpsa/

这是在jsfiddle的上述链接中执行的代码：

console.log(moment(["2022","2","31"]).toISOString());
console.log(moment(["2022",2,"31"]).toISOString());
console.log(moment(["2022","7","31"]).toISOString());
console.log(moment(["2022",7,"31"]).toISOString());

感谢@cochsen在正确的方向上轻推。

moment.js返回＆＃34;无效的日期＆＃34;三月和八月的最后一天

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