Angular 4 Date Pipe converting wrongly

问题:

I have rest service which returns a collection of objects and one of the field of the item is a date string (ISO-8601 format ) and the date value as follows

"createdDate" : "2017-02-21T12:56:50.907",

In the angular4 UI I put DatePipe to format the above date

{{resultItem.createdDate| date:'short'}}

and I am getting wrong conversion as follows

2/21/2017, 7:56 AM

instead of

2/21/2017, 0:56 AM

回答1:

You may need to create a UTC date from your date with timezone... I assume you are in the pacific timezone as the time is 7 hours from UTC...

Try this code to get a new date object without Timezone (assuming your variable is named "date"):

var datewithouttimezone = new Date(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(),  date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds());

回答2:

I resolved the issue by adding a custom pipe.

My custom pipe is based on the solution provided by Birwin. Thanks Birwin.

Here is my custom pipe named UtcDate

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'utcDate'
})
export class UtcDatePipe implements PipeTransform {

  transform(value: string): any {

    if (!value) {
      return '';
    }

    const dateValue = new Date(value);

    const dateWithNoTimezone = new Date(
      dateValue.getUTCFullYear(),
      dateValue.getUTCMonth(),
      dateValue.getUTCDate(),
      dateValue.getUTCHours(),
      dateValue.getUTCMinutes(),
      dateValue.getUTCSeconds()
    );

    return dateWithNoTimezone;
  }
}

And I also used default date pipe to format

{{createdDate | utcDate | date:'short'}}

回答3:

You can pass another param to date pipe as follows:

{{resultItem.createdDate | date : 'short' : 'UTC'}}

This param can be a timezone like '-0430' or just 'GMT'

See documentation: https://docs.angularjs.org/api/ng/filter/date