diff --git a/MD_STD.php b/MD_STD.php
index 61b99b2..9556f67 100644
--- a/MD_STD.php
+++ b/MD_STD.php
@@ -154,6 +154,21 @@ class MD_STD {
 
     }
 
+    /**
+     * Type-safe wrapper around strtotime().
+     *
+     * @param string $datetime String to convert.
+     *
+     * @return integer
+     */
+    public static function strtotime(string $datetime):int {
+
+        $output = strtotime($datetime);
+        if ($output === false) throw new MDInvalidInputDate("Invalid input date {$datetime}.");
+        return $output;
+
+    }
+
     /**
      * Wrapper for curling contents from the web.
      *