Use local tzinfo at test

Refs: #37

fhirpathpy/engine/nodes.py

@@ -763,7 +763,6 @@ def _getDateTimeInt(self):
     def _extractDateByPrecision(self, date_obj: datetime, precision):
         if date_obj.tzinfo is None or date_obj.tzinfo.utcoffset(date_obj) is None:
             date_obj = date_obj.replace(tzinfo=tz.tzutc())
-
         format = {
             1: "%Y",
             2: "%Y-%m",
@@ -773,17 +772,12 @@ def _extractDateByPrecision(self, date_obj: datetime, precision):
             6: "%Y-%m-%dT%H:%M:%S",
             7: "%Y-%m-%dT%H:%M:%S",
         }
-
         formatted_date = date_obj.strftime(format.get(precision, ""))
-
         if precision == 7:
             milliseconds = date_obj.strftime("%f")[:3]
-
             tz_offset = date_obj.strftime("%z")
             tz_formatted = tz_offset[:3] + ":" + tz_offset[3:]
-
             formatted_date = f"{formatted_date}.{milliseconds}{tz_formatted}"
-
         return formatted_date
 
     def _convertDatetime(self, date_list):

tests/test_additional.py

@@ -4,7 +4,8 @@
 
 
 def datetime_tostring_tzinfo_test():
-    tz_offset = datetime.timezone(datetime.timedelta(hours=2))
+    local_tz = datetime.datetime.now(datetime.timezone.utc).astimezone().tzinfo
+    # tz_offset = datetime.timezone(datetime.timedelta(hours=2))
     with freeze_time(
         lambda: datetime.datetime(
             year=2020,
@@ -14,7 +15,7 @@ def datetime_tostring_tzinfo_test():
             minute=52,
             second=15,
             microsecond=123456,
-            tzinfo=tz_offset,
+            tzinfo=local_tz,
         )
     ):
         assert evaluate({}, "(now() + 1 month).toString()")[0] == "2020-09-20T13:52:15.123+00:00"