igc/reader: fix for HFTZN to handle timezone that is not integer (#306)

CHANGELOG.rst

@@ -3,6 +3,10 @@ Changelog
 
 Here you can see the full list of changes between each aerofiles release.
 
+aerofiles vXXX, 2024-XX-YYYY
+----------------------------
+- igc/reader: fix for HFTZN to handle timezone that is not integer
+
 aerofiles v1.3.1, 2024-08-12
 ----------------------------
 - messed up v1.3.0 deployment. Redeploy as v1.3.1 without any changes.

aerofiles/igc/reader.py

@@ -578,7 +578,7 @@ def decode_H_competition_class(value):
 
     @staticmethod
     def decode_H_time_zone_offset(value):
-        return {'time_zone_offset': int(float(value))}
+        return {'time_zone_offset': float(value)}
 
     @staticmethod
     def decode_H_mop_sensor(value):

tests/igc/test_reader.py

@@ -518,6 +518,26 @@ def test_decode_H_time_zone_offset2():
     assert LowLevelReader.decode_H_record(line) == expected_result
 
 
+def test_decode_H_time_zone_offset3():
+    line = 'HFTZNTIMEZONE:4.5\r\n'
+    expected_result = {
+        'source': 'F',
+        'time_zone_offset': 4.5
+    }
+
+    assert LowLevelReader.decode_H_record(line) == expected_result
+
+
+def test_decode_H_time_zone_offset4():
+    line = 'HFTZNTIMEZONE:-4.5\r\n'
+    expected_result = {
+        'source': 'F',
+        'time_zone_offset': -4.5
+    }
+
+    assert LowLevelReader.decode_H_record(line) == expected_result
+
+
 def test_decode_H_mop_sensor():
     line = 'HFMOPSENSOR:MOP-(SN:1,ET=1375,0,1375,0,3.05V,p=0),Ver:0\r\n'
     expected_result = {