在 javascript/typescript 中添加日期到日期给出了完全错误的日期
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Adding days to Date in javascript / typescript gives completely wrong date
提问by ganjan
I have this very simple code, and it works sometimes but other times it gives the complete wrong date:
我有这个非常简单的代码，它有时会起作用，但有时它会给出完全错误的日期：
addDays(date: Date, days: number): Date {
console.log('adding ' + days + ' days');
console.log(date);
date.setDate(date.getDate() + days);
console.log(date);
return date;
}
Here is an example of the output:
下面是一个输出示例：
Works!
作品！
adding 7 days
error-chart.component.ts:118 Tue Aug 02 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))
error-chart.component.ts:120 Tue Aug 09 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))
Stops working:
停止工作：
adding 14 days
error-chart.component.ts:118 Tue Aug 02 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))
error-chart.component.ts:120 Thu Mar 02 2017 00:00:00 GMT+0100 (Vest-Europa (normaltid))
somehow jumps 2 years
不知何故跳了2年
adding 14 days
error-chart.component.ts:118 Thu Jul 07 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))
error-chart.component.ts:120 Thu Jun 14 2018 00:00:00 GMT+0200 (Vest-Europa (sommertid))
now 4 years!
现在4年了！
adding 14 days
error-chart.component.ts:118 Thu Jun 14 2018 00:00:00 GMT+0200 (Vest-Europa (sommertid))
error-chart.component.ts:120 Thu Apr 14 2022 00:00:00 GMT+0200 (Vest-Europa (sommertid))
回答by Lajos Arpad
You have a problem with types. If daysis 14, then it will yield 16th August correctly. However, if daysis "14", then it will yield 2nd of March.
你的类型有问题。如果days是 14，那么它将正确产生 16th August。但是，如果days是“14”，那么它将产生 3 月 2 日。
Solution:
解决方案：
addDays(date: Date, days: number): Date {
console.log('adding ' + days + ' days');
console.log(date);
date.setDate(date.getDate() + parseInt(days));
console.log(date);
return date;
}
