Started with Mongo

client/src/utils.js

@@ -0,0 +1,45 @@
+function timeDifference(current, previous) {
+    const milliSecondsPerMinute = 60 * 1000;
+    const milliSecondsPerHour = milliSecondsPerMinute * 60;
+    const milliSecondsPerDay = milliSecondsPerHour * 24;
+    const milliSecondsPerMonth = milliSecondsPerDay * 30;
+    const milliSecondsPerYear = milliSecondsPerDay * 365;
+
+    const elapsed = current - previous;
+
+    if (elapsed < milliSecondsPerMinute / 3) {
+        return 'just now';
+    }
+
+    if (elapsed < milliSecondsPerMinute) {
+        return 'less than 1 min ago';
+    } else if (elapsed < milliSecondsPerHour) {
+        return (
+            Math.round(elapsed / milliSecondsPerMinute) +
+            ' min ago'
+        );
+    } else if (elapsed < milliSecondsPerDay) {
+        return (
+            Math.round(elapsed / milliSecondsPerHour) + ' h ago'
+        );
+    } else if (elapsed < milliSecondsPerMonth) {
+        return (
+            Math.round(elapsed / milliSecondsPerDay) + ' days ago'
+        );
+    } else if (elapsed < milliSecondsPerYear) {
+        return (
+            Math.round(elapsed / milliSecondsPerMonth) + ' mo ago'
+        );
+    } else {
+        return (
+            Math.round(elapsed / milliSecondsPerYear) +
+            ' years ago'
+        );
+    }
+}
+
+export function timeDifferenceForDate(date) {
+    const now = new Date().getTime();
+    const updated = new Date(date).getTime();
+    return timeDifference(now, updated);
+}