```php // check if expired Carbon::parse($createdAt)->addSeconds($this->expires)->isPast(); // diff in seconds $then = Carbon::now()->addMinute(); $now = Carbon::now(); $then->diffInSeconds($now, false) // -60 $now->diffInSeconds($then, false) // 60 ``` ```js // parse string let will_end = '2019-02-01 10:00:00'; let then = moment(new Date(will_end)); // diff in seconds let then = moment().add(1, 'minute'); let now = moment(); then.diff(now, 'seconds'); // 60 now.diff(then, 'seconds'); // -60 ```