What is the solution to the problem when "Date" is not an instance of Date?

As I was working on fixing an issue with an "Invalid date" error in my ngx-bootstrap-bsDatepicker control and FormGroup, I came across a problem with the date value stored in the object this.ts.startDateTime when compared to a new Date() object.

08:11:03.723 ts-form.component.ts:240 HZyWZhwowB - this.ts.startDateTime 2019-07-16T20:18:24.9133333
08:11:03.724 ts-form.component.ts:242 HZyWZhwowB - testDate Wed Jul 17 2019 08:11:03 GMT-0400 (Eastern Daylight Time)
08:11:03.724 ts-form.component.ts:244 HZyWZhwowB - this.ts.startDateTime instanceof Date false
08:11:03.725 ts-form.component.ts:246 HZyWZhwowB - testDate instanceof Date true

The property causing the issue is:

/**
  * Gets or sets the start date.
  */
startDateTime: Date;

It's evident that the values are not the same. The object contains data fetched from an HTTP Request to a WebAPI controller, and the TypeScript interface is auto-generated from models in the WebAPI. For most parts of the application, the current Date value in the object works fine.

How can I best resolve this problem within my Angular application and convert this value into a valid date?

Angular 5 - ASP.NET API
momentjs is available in the application, but not used in my component at the moment.

angulartypescriptdatengx-bootstrap

Answer №1

ts.startTime is in string format, so it needs to be converted to a Date object:

let newDate = new Date(this.ts.startDateTime);

It's important to follow a standard like ISO 8601 to prevent breaking the code above.

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