diff --git a/src/Command/WarrantySMSCommand.php b/src/Command/WarrantySMSCommand.php
index 3e8591aa..0b6f9d39 100644
--- a/src/Command/WarrantySMSCommand.php
+++ b/src/Command/WarrantySMSCommand.php
@@ -24,7 +24,7 @@ class WarrantySMSCommand extends Command
         $this->setName('warranty:sms')
             ->setDescription('Sends an SMS message to users whose warranty expired one month ago.')
             ->setHelp('Sends warranty SMS.')
-            ->addArgument('date', InputArgument::REQUIRED, 'Date to use as basis of expiration. Defaults to current date.');
+            ->addArgument('date', InputArgument::OPTIONAL, 'Date to use as basis of expiration. Defaults to current date.');
     }
 
     public function __construct(EntityManagerInterface $em, RisingTideGateway $gateway)
@@ -37,9 +37,14 @@ class WarrantySMSCommand extends Command
 
     protected function execute(InputInterface $input, OutputInterface $output)
     {
+        $date = new DateTime();
         $date_string = $input->getArgument('date');
-        $date = DateTime::createFromFormat('Ymd', $date_string);
-        $date->modify('-1 month');
+
+        if (!empty($date_string))
+        {
+            $date = DateTime::createFromFormat('Ymd', $date_string);
+            $date->modify('-1 month');
+        }
 
         $warrs = $this->em->getRepository(Warranty::class)->findBy(['date_expire' => $date]);