adding a standardized timestamp format to settings for use with strftime

config/settings/base.py

@@ -360,6 +360,7 @@ SOUTH_TESTS_MIGRATE = False
 # system time zone.
 TIME_ZONE = 'UTC'
 GRACE_DATETIME_FORMAT = 'Y-m-d H:i:s T'
+GRACE_STRFTIME_FORMAT = '%Y-%m-%d %H:%M:%S %Z'
 
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