how to take configration from json for angular every time code example

Example 1: how to compare current date and time with another date and time in android

Date date1 = calendar1.getTime();
Date date2 = calendar2.getTime();
if (date1.compareTo(date2) > 0)
{    Log.i("app", "Date1 is after Date2");} 
else if (date1.compareTo(date2) < 0) 
{    Log.i("app", "Date1 is before Date2");} 
else if (date1.compareTo(date2) == 0) 
{    Log.i("app", "Date1 is equal to Date2");}

Example 2: angular add debounce time before putting valu in subject next

import {Component}   from '@angular/core';
import {FormControl} from '@angular/forms';
import {Observable}  from 'rxjs/Observable';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/throttleTime';
import 'rxjs/add/observable/fromEvent';

@Component({
  selector: 'my-app',
  template: `<input type=text [value]="firstName" [formControl]="firstNameControl">
    <br>{{firstName}}`
})
export class AppComponent {
  firstName        = 'Name';
  firstNameControl = new FormControl();
  formCtrlSub: Subscription;
  resizeSub:   Subscription;
  ngOnInit() {
    // debounce keystroke events
    this.formCtrlSub = this.firstNameControl.valueChanges
      .debounceTime(1000)
      .subscribe(newValue => this.firstName = newValue);
    // throttle resize events
    this.resizeSub = Observable.fromEvent(window, 'resize')
      .throttleTime(200)
      .subscribe(e => {
        console.log('resize event', e);
        this.firstName += '*';  // change something to show it worked
      });
  }
  ngDoCheck() { console.log('change detection'); }
  ngOnDestroy() {
    this.formCtrlSub.unsubscribe();
    this.resizeSub  .unsubscribe();
  }
}