diff --git a/datascout/_timescout.py b/datascout/_timescout.py
index fbb9f08071f7e65571f7366bb0a9440c972e6567..1d0c2872cb5cc290c043d6025bb2247f12b300f8 100644
--- a/datascout/_timescout.py
+++ b/datascout/_timescout.py
@@ -3,8 +3,6 @@ Implementation of sweet functions to convert time data from one format to anothe
 """
 import pytz
 import datetime
-import time
-from dateutil.parser import parse as dateparser
 
 def unixtime_to_datetime(unixtime_ns, time_zone = 'utc'):
     if isinstance(time_zone, str):
@@ -37,7 +35,7 @@ def datetime_to_unixtime(date_time):
         epoch = datetime.datetime.fromtimestamp(0, tz=datetime.timezone.utc)
     return int((date_time-epoch).total_seconds()*1e6)*1000
 
-def string_to_datetime(date_string, check_timezone=True):
+def string_to_datetime(date_string):
     '''
     Uses standard datetime function to parse a string in the ISO format
 
@@ -46,14 +44,10 @@ def string_to_datetime(date_string, check_timezone=True):
       Out: datetime.datetime(2022, 1, 21, 15, 55, 34, 123555, tzinfo=datetime.timezone(datetime.timedelta(seconds=3600), 'CET'))
 
     :param date_string:
-    :param check_timezone: check that output datetime have a timezone. If not, add local timezone info (default=True)
     :return:
     '''
-    output = dateparser(date_string)
-    if check_timezone and output.tzinfo is None:
-        local_time_zone = datetime.datetime.utcnow().astimezone().tzinfo
-        output = output.astimezone(local_time_zone)
-    return output
+
+    return datetime.datetime.fromisoformat(date_string).astimezone()
 
 def string_to_unixtime(date_string):
     '''
@@ -62,7 +56,7 @@ def string_to_unixtime(date_string):
     :param date_string: date+time in ISO string format
     :return: unix timestamp in ns
     '''
-    return datetime_to_unixtime(string_to_datetime(date_string, check_timezone=False))
+    return datetime_to_unixtime(string_to_datetime(date_string))
 
 def unixtime_to_string(unixtime_ns, time_zone = 'utc', format = '%Y-%m-%d %H:%M:%S.%f'):
     '''