misc

src/app/pipes/date-ago.pipe.ts

@@ -0,0 +1,37 @@
+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({
+  name: 'dateAgo',
+  pure: true
+})
+export class DateAgoPipe implements PipeTransform {
+
+  transform(value: any, args?: any): any {
+    if (value) {
+      const seconds = Math.floor((+new Date() - +new Date(value)) / 1000);
+      if (seconds < 29) // less than 30 seconds ago will show as 'Just now'
+        return 'Just now';
+      const intervals: { [key: string]: number } = {
+        'year': 31536000,
+        'month': 2592000,
+        'week': 604800,
+        'day': 86400,
+        'hour': 3600,
+        'minute': 60,
+        'second': 1
+      };
+      let counter;
+      for (const i in intervals) {
+        counter = Math.floor(seconds / intervals[i]);
+        if (counter > 0)
+          if (counter === 1) {
+            return counter + ' ' + i + ''; // singular (1 day ago)
+          } else {
+            return counter + ' ' + i + 's'; // plural (2 days ago)
+          }
+      }
+    }
+    return value;
+  }
+
+}