diff --git a/phpseclib/File/ASN1.php b/phpseclib/File/ASN1.php
index 93fe6c95..cf23dd73 100644
--- a/phpseclib/File/ASN1.php
+++ b/phpseclib/File/ASN1.php
@@ -21,7 +21,6 @@
 
 namespace phpseclib3\File;
 
-use DateTime;
 use phpseclib3\Common\Functions\Strings;
 use phpseclib3\File\ASN1\Element;
 use phpseclib3\Math\BigInteger;