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frontend/src/app/shared/pipes/time-since/time-since.pipe.ts

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+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({ name: 'timeSince' })
+export class TimeSincePipe implements PipeTransform {
+  transform(timestamp: number) {
+    const minutes = ((new Date().getTime()) - (new Date(timestamp * 1000).getTime())) / 1000 / 60;
+    if (minutes >= 120) {
+      return Math.floor(minutes / 60) + ' hours';
+    }
+    if (minutes >= 60) {
+      return Math.floor(minutes / 60) + ' hour';
+    }
+    if (minutes <= 1) {
+      return '< 1 minute';
+    }
+    if (minutes === 1) {
+      return '1 minute';
+    }
+    return Math.round(minutes) + ' minutes';
+  }
+}