fix import in older python versions

test/run_multiple_tests.py

@@ -14,10 +14,14 @@ from datetime import datetime
 from threading import Thread
 from time import sleep
 from unittest.mock import patch
-from zoneinfo import ZoneInfo
 
 import time_machine
 
+try:
+    from zoneinfo import ZoneInfo
+except ImportError:
+    from backports.zoneinfo import ZoneInfo
+
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 # from ffplayout import playlist

test/run_time_machine.py

@@ -10,16 +10,20 @@ specially when the day_start time is in the night.
 import datetime
 import os
 import sys
-from zoneinfo import ZoneInfo
 
 import time_machine
 
+try:
+    from zoneinfo import ZoneInfo
+except ImportError:
+    from backports.zoneinfo import ZoneInfo
+
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 # set time zone
 _TZ = ZoneInfo("Europe/Berlin")
 # fake date and time
-SOURCE_TIME = [2021, 2, 8, 23, 59, 50]
+SOURCE_TIME = [2021, 2, 14, 5, 58, 5]
 
 
 @time_machine.travel(datetime.datetime(*SOURCE_TIME, tzinfo=_TZ))

test/run_time_warp.py

@@ -12,10 +12,14 @@ import datetime
 import os
 import sys
 import time
-from zoneinfo import ZoneInfo
 
 import time_machine
 
+try:
+    from zoneinfo import ZoneInfo
+except ImportError:
+    from backports.zoneinfo import ZoneInfo
+
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 # set time zone