Celerybeat uses UTC even with time zone settings

I find that celerybeat uses UTC time in its planning (and displays logs in British time ?!), although I believe that I have the necessary settings in the django.py settings:

TIME_ZONE = 'UTC'
USE_TZ = True
CELERY_ENABLE_UTC = True
CELERY_TIMEZONE = 'Australia/Sydney'
CELERYBEAT_SCHEDULE = 
    "testRunBeat" : {
        "task" : "experiments.tasks.testHeartBeat",
        "schedule" : crontab(minute = "*/1", hour="13-14"),    
}

I tried switching the TIME_ZONE variable with no luck

I use:

django==1.4
celery==2.5.5
django-celery==2.5.5

thank