在 Typescript 中转换日期类型

Question

So I'm getting Data from a C# Rest-Server. One value of the array is of the type Date. When I want to calculate with it for example:

let difference = date1.getTime() - date2.getTime();

I get the following error:

date1.getTime is not a function

I guess the error is, that Date of Java is not the same as Date of Typescript.

Is there a way to convert a value of type Date (Java) to type Date (TypeScript)?

Or I'm I wrong and the error is caused by something else?

Answer 1

您需要将日期转换为Date Object才能应用其方法。

let difference = new Date(date1).getTime() - new Date(date2).getTime();

Answer 2

JSON has no date object. Usually a string is sent, take a closer look at what your API is providing. Sometimes it is a timestamp - depending on your GSON/Jackson/.. configuration. Timestamp needs a timezone offset too, therefore I'd prefer a string based format with included time zone. Usually it looks like this: "2018-03-10T09:06:08.068Z"

You can read this string into a JavaScript Date by passing it into the constructor: new Date(dateString) . Now you have access to the methods.

Void already posted a vanilla JS implementation, but it gets even easier if you use a lib for that. I'd highly recommend date-fns. It accepts strings, so there is no need to create a new date:

differenceInMilliseconds(dateLeft, dateRight)

Docs: https://date-fns.org/v1.29.0/docs/differenceInMilliseconds

Answer 3

console.log((new Date().getTime() < new Date("2022-02-03").getTime()).toString());