update tests to set correct timezone on POSIX systems

tests/test_date.py

@@ -1,10 +1,17 @@
 import os
+import sys
+import time
 import json
 import unittest
 import jc.parsers.date
 
 THIS_DIR = os.path.dirname(os.path.abspath(__file__))
 
+# Set the timezone on POSIX systems. Need to manually set for Windows tests
+if not sys.platform.startswith('win32'):
+    os.environ['TZ'] = 'America/Los_Angeles'
+    time.tzset()
+
 
 class MyTests(unittest.TestCase):