diff --git a/rowers/c2stuff.py b/rowers/c2stuff.py
index 503dd850..d7544dfc 100644
--- a/rowers/c2stuff.py
+++ b/rowers/c2stuff.py
@@ -238,7 +238,7 @@ def create_async_workout(alldata,user,c2id):
     duration = dataprep.totaltime_sec_to_string(totaltime)
 
     try:
-        timezone_str = tz(data['timezone'])
+        timezone_str = data['timezone']
     except:
         timezone_str = 'UTC'
 
diff --git a/rowers/tasks.py b/rowers/tasks.py
index fdaf22fe..9bfb8d28 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -419,7 +419,7 @@ def handle_c2_import_stroke_data(c2token,
             duration = datetime.datetime.strptime(duration,'%H:%M:%S.%f').time()
 
             try:
-                timezone_str = tz(workoutdata['timezone'])
+                timezone_str = workoutdata['timezone']
             except:
                 timezone_str = 'UTC'
 
@@ -2991,7 +2991,7 @@ def handle_c2_async_workout(alldata,userid,c2token,c2id,delaysec,defaulttimezone
     c2id = data['id']
     workouttype = data['type']
     verified = data['verified']
-    startdatetime = iso8601.parse_date(data['date'])
+    startdatetime = iso8601.parse_date(data['date_utc'])
     weightclass = data['weight_class']
 
     try:
@@ -3013,21 +3013,18 @@ def handle_c2_async_workout(alldata,userid,c2token,c2id,delaysec,defaulttimezone
 
     totaltime = data['time']/10.
     duration = totaltime_sec_to_string(totaltime)
+    starttimeunix = arrow.get(startdatetime).timestamp()-totaltime
+    startdatetime = arrow.get(starttimeunix)
 
-    try:
-        timezone_str = tz(data['timezone'])
-    except:
-        timezone_str = defaulttimezone
+    timezone = pytz.timezone(data['timezone'])
+    startdatetime = startdatetime.astimezone(timezone)
 
-    startdatetime = startdatetime.replace(tzinfo=None)
-    tz = pytz.timezone(timezone_str)
-    startdatetime = tz.localize(startdatetime)
 
     workoutdate = startdatetime.astimezone(
-        pytz.timezone(timezone_str)
+        timezone
     ).strftime('%Y-%m-%d')
     starttime = startdatetime.astimezone(
-        pytz.timezone(timezone_str)
+        timezone
     ).strftime('%H:%M:%S')
 
     try:
@@ -3056,8 +3053,6 @@ def handle_c2_async_workout(alldata,userid,c2token,c2id,delaysec,defaulttimezone
     cum_time = res[0]
     lapidx = res[1]
 
-    starttimeunix = arrow.get(startdatetime).timestamp()
-    starttimeunix = starttimeunix-cum_time.max()
 
     unixtime = cum_time+starttimeunix
     # unixtime[0] = starttimeunix
@@ -3134,6 +3129,7 @@ def handle_c2_async_workout(alldata,userid,c2token,c2id,delaysec,defaulttimezone
         'workouttype':workouttype,
         'boattype':'1x',
         'c2id':c2id,
+        'timezone':str(timezone)
     }
 
     session = requests.session()
@@ -3165,8 +3161,11 @@ def handle_c2_async_workout(alldata,userid,c2token,c2id,delaysec,defaulttimezone
 
     parkedids = []
     with open('c2blocked.json','r') as c2blocked:
-        jsondata = json.load(c2blocked)
-        parkedids = jsondata['ids']
+        try:
+            jsondata = json.load(c2blocked)
+            parkedids = jsondata['ids']
+        except JSONDecodeError:
+            parkedids = []
 
     newparkedids = [id for id in parkedids if id != newc2id]
     with open('c2blocked.json','wt') as c2blocked:
@@ -3364,7 +3363,7 @@ def fetch_strava_workout(stravatoken,oauth_data,stravaid,csvfilename,userid,debu
         comments = ' '
 
     try:
-        thetimezone = tz(workoutsummary['timezone'])
+        thetimezone = workoutsummary['timezone']
     except:
         thetimezone = 'UTC'
 
diff --git a/rowers/tests/test_imports.py b/rowers/tests/test_imports.py
index cd4640a3..bfef0eee 100644
--- a/rowers/tests/test_imports.py
+++ b/rowers/tests/test_imports.py
@@ -158,6 +158,7 @@ class C2Objects(DjangoTestCase):
         self.r.c2token = '12'
         self.r.c2refreshtoken = 'ab'
         self.r.tokenexpirydate = arrow.get(datetime.datetime.now()+datetime.timedelta(days=1)).datetime
+        self.r.defaulttimezone = 'Europe/Prague'
         self.r.save()
         self.c.login(username='john',password='koeinsloot')
 
@@ -342,6 +343,7 @@ class C2Objects(DjangoTestCase):
         res = tasks.handle_c2_async_workout(alldata,self.u.id,self.r.c2token,33991243,0,self.r.defaulttimezone)
         self.assertEqual(res,1)
 
+
 @override_settings(TESTING=True)
 class C2ObjectsTokenExpired(DjangoTestCase):
     def setUp(self):
diff --git a/rowers/views/workoutviews.py b/rowers/views/workoutviews.py
index 1f46d518..0767310c 100644
--- a/rowers/views/workoutviews.py
+++ b/rowers/views/workoutviews.py
@@ -4813,8 +4813,8 @@ def workout_upload_api(request):
     totalDistance = post_data.get('totalDistance',None)
     elapsedTime = post_data.get('elapsedTime',None)
     summary = post_data.get('summary',None)
-
-
+    timezone = post_data.get('timezone',None)
+    
     r = None
     if form.is_valid():
         t = form.cleaned_data['title']
@@ -4905,6 +4905,13 @@ def workout_upload_api(request):
             return JSONResponse(status=200,data=message)
 
         w = Workout.objects.get(id=id)
+        if timezone is not None:
+            w.startdatetime = w.startdatetime.astimezone(pytz.timezone(timezone))
+            w.workoutdate = w.startdatetime.strftime('%Y-%m-%d')
+            w.starttime = w.starttime.strftime('%H:%M:%S')
+            w.timezone = timezone
+            w.save()
+
 
 
         if make_plot: # pragma: no cover