diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index a824f571..acce7fa3 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -1156,7 +1156,8 @@ def save_workout_database(f2, r, dosmooth=True, workouttype='rower',
                           consistencychecks=False,
                           startdatetime='',
                           workoutid='',
-                          impeller=False):
+                          impeller=False,
+                          timezone=''):
 
     message = None
 
@@ -1173,7 +1174,7 @@ def save_workout_database(f2, r, dosmooth=True, workouttype='rower',
     row = rdata(f2, rower=rr)
 
     startdatetime, startdate, starttime, timezone_str, partofday = get_startdate_time_zone(
-        r, row, startdatetime=startdatetime)
+        r, row, startdatetime=startdatetime, timezone=timezone)
 
     if title is None or title == '':
         title = 'Workout'
@@ -1463,6 +1464,7 @@ def new_workout_from_file(r, f2,
                           rpe=-1,
                           makeprivate=False,
                           startdatetime='',
+                          timezone='',
                           notes='',
                           workoutid='',
                           oarlockfirmware='',
@@ -1641,6 +1643,7 @@ def new_workout_from_file(r, f2,
         workoutsource=workoutsource,
         summary=summary,
         startdatetime=startdatetime,
+        timezone=timezone, 
         rpe=rpe,
         inboard=inboard, oarlength=oarlength,
         seatnumber=seatnumber, boatname=boatname,
diff --git a/rowers/dataroutines.py b/rowers/dataroutines.py
index 001f6fcb..d020faf6 100644
--- a/rowers/dataroutines.py
+++ b/rowers/dataroutines.py
@@ -905,7 +905,7 @@ def clean_df_stats_pl(datadf, workstrokesonly=True, ignorehr=True,
     return datadf
 
 
-def getpartofday(row, r):
+def getpartofday(row, r, startdatetime=None, timezone=''):
     workoutstartdatetime = row.rowdatetime
     try:  # pragma: no cover
         latavg = row.df[' latitude'].mean()
@@ -932,6 +932,8 @@ def getpartofday(row, r):
         workoutstartdatetime = row.rowdatetime
 
     h = workoutstartdatetime.astimezone(pytz.timezone(timezone_str)).hour
+    if startdatetime is not None:
+        h = startdatetime.hour
 
     if h < 12:  # pragma: no cover
         return "Morning"
@@ -1170,7 +1172,9 @@ parsers = {
 }
 
 
-def get_startdate_time_zone(r, row, startdatetime=None):
+def get_startdate_time_zone(r, row, startdatetime=None, timezone=''):
+    if timezone != '':
+        preserve_timezone = True
     if isinstance(startdatetime, str):
         try:
             startdatetime = pendulum.parse(startdatetime)
@@ -1184,15 +1188,15 @@ def get_startdate_time_zone(r, row, startdatetime=None):
             timezone_str = 'Ect/GMT'
     elif startdatetime == '':
         startdatetime = row.rowdatetime
-    else:
-        startdatetime = row.rowdatetime
+    #else:
+    #    startdatetime = row.rowdatetime
 
     try:
         _ = startdatetime.tzinfo
     except AttributeError:  # pragma: no cover
         startdatetime = row.rowdatetime
 
-    partofday = getpartofday(row, r)
+    partofday = getpartofday(row, r, startdatetime=startdatetime, timezone=timezone)
 
     if startdatetime.tzinfo is None or str(startdatetime.tzinfo) in ['tzutc()', 'Ect/GMT']:
         timezone_str = 'UTC'
@@ -1200,6 +1204,8 @@ def get_startdate_time_zone(r, row, startdatetime=None):
             startdatetime = timezone.make_aware(startdatetime)
         except ValueError:  # pragma: no cover
             pass
+        except AttributeError:
+            pass
 
         try:
             latavg = row.df[' latitude'].mean()
@@ -1232,8 +1238,23 @@ def get_startdate_time_zone(r, row, startdatetime=None):
         timezone_str = str(startdatetime.tzinfo)
 
     try:
-        startdatetime = startdatetime.astimezone(pytz.timezone(timezone_str))
+        if not preserve_timezone:
+            startdatetime = startdatetime.astimezone(pytz.timezone(timezone_str))
     except UnknownTimeZoneError:
+        try:
+            offset = timezone_str.strip("(TimeZone('')").split(":")
+            hours = int(offset[0])
+            minutes = int(offset[1])
+            tz_offset = datetime.timedelta(hours=hours, minutes=minutes)
+            tz = datetime.timezone(tz_offset)
+            utc_offset = tz.utcoffset(datetime.utcnow()).total_seconds()
+            for zone in pytz.all_timezones:
+                if pytz.timezone(zone).utcoffset(datetime.utcnow()).total_seconds() == utc_offset:
+                    timezone_str = zone
+                    break
+        except Exception as e:
+            pass
+
         startdatetime = startdatetime.astimezone(pytz.utc)
         
     startdate = startdatetime.strftime('%Y-%m-%d')
diff --git a/rowers/tests/testdata/testdata.tcx.gz b/rowers/tests/testdata/testdata.tcx.gz
index b4e8bb72..b3805e75 100644
Binary files a/rowers/tests/testdata/testdata.tcx.gz and b/rowers/tests/testdata/testdata.tcx.gz differ
diff --git a/rowers/views/workoutviews.py b/rowers/views/workoutviews.py
index 26ec16f8..07ce9525 100644
--- a/rowers/views/workoutviews.py
+++ b/rowers/views/workoutviews.py
@@ -4981,6 +4981,7 @@ def workout_upload_api(request):
     garminid = post_data.get('garminid','')
     workoutid = post_data.get('id','')
     startdatetime = post_data.get('startdatetime', '')
+    timezone = post_data.get('timezone','')
     oarlockfirmware = post_data.get('oarlockfirmware', None)
     inboard = post_data.get('inboard', None)
     oarlength = post_data.get('oarlength', None)
@@ -5079,6 +5080,7 @@ def workout_upload_api(request):
             notes=notes,
             uploadoptions=post_data,
             startdatetime=startdatetime,
+            timezone=timezone,
             oarlockfirmware=oarlockfirmware,
             inboard=inboard,
             oarlength=oarlength,