Refactor SightingItem to display time since sighting; add timeAgo utility function

src/utils/utils.ts

@@ -4,3 +4,20 @@ export const formatNumberPlate = (plate: string) => {
   const formattedPlate = splittedPlate?.join("");
   return formattedPlate;
 };
+
+export const timeAgo = (timestampmili: number) => {
+  const diffMs = Date.now() - new Date(timestampmili).getTime();
+  const diffMins = Math.floor(diffMs / 60000);
+  if (diffMins < 60) {
+    if (diffMins < 1) {
+      return "just now";
+    }
+    return `${diffMins === 1 ? "1 minute" : diffMins + " minutes"} ago`;
+  } else {
+    const diffHours = Math.floor(diffMins / 60);
+    if (diffHours < 1) {
+      return "just now";
+    }
+    return `${diffHours === 1 ? "1 hour" : diffHours + " hours"} ago`;
+  }
+};