New base code for mempool blockchain explorerer

frontend/src/app/components/time-since/time-since.component.ts

@@ -0,0 +1,29 @@
+import { Component, OnInit, OnDestroy, ChangeDetectionStrategy, Input, ChangeDetectorRef } from '@angular/core';
+
+@Component({
+  selector: 'app-time-since',
+  template: `{{ time | timeSince : trigger }}`,
+  changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class TimeSinceComponent implements OnInit, OnDestroy {
+  interval: number;
+  trigger = 0;
+
+  @Input() time: number;
+
+  constructor(
+    private ref: ChangeDetectorRef
+  ) { }
+
+  ngOnInit() {
+    this.interval = window.setInterval(() => {
+      this.trigger++;
+      this.ref.markForCheck();
+    }, 1000 * 60);
+  }
+
+  ngOnDestroy() {
+    clearInterval(this.interval);
+  }
+
+}