diff --git a/youtube_dl/extractor/academicearth.py b/youtube_dl/extractor/academicearth.py
index c450c30ca..ac05f8246 100644
--- a/youtube_dl/extractor/academicearth.py
+++ b/youtube_dl/extractor/academicearth.py
@@ -1,11 +1,6 @@
-import datetime
-import json
 import re
 
 from .common import InfoExtractor
-from ..utils import (
-    remove_start,
-)
 
 
 class AcademicEarthCourseIE(InfoExtractor):