Sadly, dateutil is not actually part of the standard lib.

Thus, using the XEP-0082 and XEP-0202 introduces a dependency
on the dateutil package (installable using pip install python-dateutil).

Maybe we'll be able to rework how these plugins work to avoid
needing dateutil, but for now this will have to do.

sleekxmpp/plugins/xep_0082.py

@@ -6,11 +6,18 @@
     See the file LICENSE for copying permission.
 """
 
+import logging
 import datetime as dt
-from dateutil import parser
-from dateutil.tz import tzoffset, tzutc
+
 from sleekxmpp.plugins.base import base_plugin
 
+try:
+    from dateutil import parser
+    from dateutil.tz import tzoffset, tzutc
+except e:
+    log = logging.getLogger(__name__)
+    log.warning("XEP-0082 plugin requires dateutil")
+
 
 # =====================================================================
 # To make it easier for stanzas without direct access to plugin objects