How to Handle ISO 8601 Dates in Angular2 Using DatePipe?

Question

How to Handle ISO 8601 Dates in Angular2 Using DatePipe?

I recently attempted to implement a basic date pipe in my angular2 application:

Registered: {{user.registered | date:'shortDate'}}

However, I encountered the following error:

Invalid argument '2016-03-28T07:25:40.824Z' for pipe 'DatePipe' in [{{user && user.registered | date:'shortDate' }} in UserDialog@16:57]

In order to resolve this issue, I defined a minimal User model which is shared among various components:

export class User { public registered: Date; }

The backend provides the user data in ISO 8601 format: 2016-03-28T07:26:01.202Z.

To make it work, I created a custom pipe as shown below:

import {Pipe, PipeTransform} from 'angular2/core';
/**
 * The default ISO Date is not parseable by ts compiler or some such.
*/
@Pipe({ name: 'betterDate' })
export class BetterDatePipe implements PipeTransform {

  transform(date: number): string {

    let d = new Date(date);
    return d.toLocaleDateString();
  }
}

The tongue-in-cheek name, BetterDatePipe, signifies my attempt to improve upon angular2 coding practices.

typescript angular iso8601

Answer 1

Answer №1

Instead of creating a new pipe, consider using an intermediary one to convert the component's string value into a date format:

string-to-date-converter.pipe.ts:

import {Pipe, PipeTransform} from '@angular/core';
/**
 * Pipe to convert a string to a date
 */
@Pipe({name: 'convertStringToDate'})
export class ConvertStringToDatePipe implements PipeTransform {
    /**
     * Constructor
     */
    constructor() {
    }
    /**
     * Convert a string representing a date into a Date object
     * @param value The date as a string
     * @returns {Date} The converted Date object
     */
    transform(value: string): Date {
        return new Date(value);
    }
}

Component

import {ConvertStringToDatePipe} from './string-to-date-converter.pipe';
@Component({
    ...
    pipes: [ConvertStringToDatePipe],
    ...
})

Template

Date Registered: {{user.registered | convertStringToDate | date:'shortDate'}}

Answer 2

Instead of creating a new pipe, consider using an intermediary one to convert the component's string value into a date format:

string-to-date-converter.pipe.ts:

import {Pipe, PipeTransform} from '@angular/core';
/**
 * Pipe to convert a string to a date
 */
@Pipe({name: 'convertStringToDate'})
export class ConvertStringToDatePipe implements PipeTransform {
    /**
     * Constructor
     */
    constructor() {
    }
    /**
     * Convert a string representing a date into a Date object
     * @param value The date as a string
     * @returns {Date} The converted Date object
     */
    transform(value: string): Date {
        return new Date(value);
    }
}

Component

import {ConvertStringToDatePipe} from './string-to-date-converter.pipe';
@Component({
    ...
    pipes: [ConvertStringToDatePipe],
    ...
})

Template

Date Registered: {{user.registered | convertStringToDate | date:'shortDate'}}

Answer 3

Answer №2

Although both methods have their merits, the code provided by the OP seems somewhat limiting as it always returns the same date format. Ultimately, you may find yourself needing to write another pipe to change that format.

The second method appears to be much more manageable. However, there are a few things to consider. The pipes cannot be included in the @Component directly; instead, you would need to refer to them in the app.module.ts file with an import statement:

import { StringToDatePipe } from './???/string-to-date.pipe'

You will also need to include the pipe in the @NgModule({...}) declarations section further down the page.

Once these steps are completed, you can use the custom pipe and then move on to utilizing Angular's Date Pipe.

Answer 4

Although both methods have their merits, the code provided by the OP seems somewhat limiting as it always returns the same date format. Ultimately, you may find yourself needing to write another pipe to change that format.

The second method appears to be much more manageable. However, there are a few things to consider. The pipes cannot be included in the @Component directly; instead, you would need to refer to them in the app.module.ts file with an import statement:

import { StringToDatePipe } from './???/string-to-date.pipe'

You will also need to include the pipe in the @NgModule({...}) declarations section further down the page.

Once these steps are completed, you can use the custom pipe and then move on to utilizing Angular's Date Pipe.

Answer 5

Answer №3

The statement clearly indicates that the argument is a string, not a Date. It is necessary to convert it into a Date prior to using it in the pipe. JSON does not have support for the Date type.

user.joined = new Date(json.joined);

Alternatively, you can use a similar method based on how the user object is obtained.

For more information, refer to Converting string to date in js

Answer 6

The statement clearly indicates that the argument is a string, not a Date. It is necessary to convert it into a Date prior to using it in the pipe. JSON does not have support for the Date type.

user.joined = new Date(json.joined);

Alternatively, you can use a similar method based on how the user object is obtained.

For more information, refer to Converting string to date in js

How to Handle ISO 8601 Dates in Angular2 Using DatePipe?

Answer №1

Answer №2

Answer №3

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