ng-datefns-pipes

ng-datefns-pipes

Angular pipes based on date-fns. Date pipe, time-ago pipe, minDate pipe, maxDate pipe, distanceBetweenDates pipe. I initially built these for Ionic projects, because the Angular date pipe was performing poorly on some mobile devices, and the date-fns functions were not exhibiting problems. However, no use of Ionic is required. This npm library should work with any Angular 5 project, and any Ionic 3 project.

Installation

npm install ng-datefns-pipes --save

Sample usage

Date pipe:

napoleon = new Date(1804, 11, 2);                           // in ts file
Napoleon crowned himself emperor on {{ napoleon | date }}.  // in template
Napoleon crowned himself emperor on December 2nd, 1804.     // output

Time ago pipe:

aquinas = new Date(1274, 2, 7);          // in ts file
Aquinas died {{ aquinas | ago }}.<br>    // in template
Aquinas died almost 744 years ago.       // output

Time ago pipe second example:

now = new Date();                              // in ts file
You entered this page {{ now | ago }}.         // in template
You entered this page less than 5 seconds ago. // output (updates every 15 seconds)

Distance between dates:

datePair = [ this.aquinas, this.napoleon ];                                                // in ts file
Aquinas's and Napoleon's actions were separated by {{ datePair | distanceBetweenDates }}.  // in template
Aquinas's and Napoleon's actions were separated by almost 531 years.                       // output

Min date:

dateArray = [ this.aquinas, this.napoleon, this.now ];    // in ts file
The earliest of those dates is {{ dateArray | minDate }}. // in template
The earliest of those dates is March 7th, 1274.           // output 

Max date:

The most recent of those dates is {{ dateArray | maxDate }}. // in template (ts file same as before)
The most recent of those dates is ___.    // <-- output, blank contains today's date

Basic setup

In app.module.ts:

import { DatePipesModule } from 'ng-datefns-pipes';

@NgModule({
  declarations: [],
  imports: [
    DatePipesModule.forRoot() // < -- add this line
  ],
  bootstrap: [],
  entryComponents: [],
  providers: []
})
export class AppModule {}

This gives you access to all the (English language) date pipes, with the default configuration. For details, see the API below.

Advanced Setup

You can specify a default date format; whether date distance functions include seconds; and the prefix, suffix, refresh rate and use of seconds of the timeAgo pipe. (For more detail about these settings, see the API below. You can also set and reset each setting during the program by injecting the DatePipeManager.)

In app.module.ts:

import { DatePipesModule, DatePipeConfiguration } from 'ng-datefns-pipes';

const DATE_PIPE_CONFIG: DatePipeConfiguration = {
   defaultDateFormat: 'your date format string',    // default: 'MMMM Do, YYYY'
   dateDistanceIncludesSeconds: your boolean here,  // default: false
   agoPipeOptions: {
     refreshRate: your milliseconds here,           // default: 15000
     prefix: 'your prefix string',                  // default: ''
     suffix: 'your suffix string',                  // default: ' ago' <-- note the space
     includeSeconds: your boolean here              // default: false
   }
}

@NgModule({
  declarations: [],
  imports: [
    DatePipesModule.forRoot(DATE_PIPE_CONFIG) // < -- add this line
  ],
  bootstrap: [],
  entryComponents: [],
  providers: []
})
export class AppModule {}