3 files changed, 45 insertions, 9 deletions

diff --git a/.gitignore b/.gitignore
index a9e5af7..11c62a9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@
 /dist/
 __pycache__/
 build
+.idea/
+*venv/
\ No newline at end of file
diff --git a/glucometerutils/common.py b/glucometerutils/common.py
index ad56b8b..f549087 100644
--- a/glucometerutils/common.py
+++ b/glucometerutils/common.py
@@ -28,6 +28,7 @@ class Meal(enum.Enum):
 class MeasurementMethod(enum.Enum):
     BLOOD_SAMPLE = 'blood sample'
     CGM = 'CGM' # Continuous Glucose Monitoring
+    TIME = 'time'
 
 
 def convert_glucose_unit(value, from_unit, to_unit):
@@ -98,6 +99,22 @@ class KetoneReading:
             self.comment)
 
 @attr.s
+class TimeAdjustment:
+    timestamp = attr.ib()  # type: datetime.datetime
+    old_timestamp = attr.ib()  # type: datetime.datetime
+    measure_method = attr.ib(
+        default=MeasurementMethod.TIME,
+        validator=attr.validators.in_(
+            MeasurementMethod))  # type: MeasurementMethod
+
+    def as_csv(self, unit):
+        del unit
+        return '"%s","","%s","%s"' % (
+            self.timestamp, self.measure_method.value, self.old_timestamp
+        )
+
+
+@attr.s
 class MeterInfo:
     """General information about the meter.
 
diff --git a/glucometerutils/drivers/fslibre.py b/glucometerutils/drivers/fslibre.py
index ecf6dd6..7d3e496 100644
--- a/glucometerutils/drivers/fslibre.py
+++ b/glucometerutils/drivers/fslibre.py
@@ -57,6 +57,15 @@ _ARRESULT_TYPE2_ENTRY_MAP = (
     (28, 'errors'),
 )
 
+_ARRESULT_TYPE5_ENTRY_MAP = (
+    (9, 'old_month'),
+    (10, 'old_day'),
+    (11, 'old_year'),
+    (12, 'old_hour'),
+    (13, 'old_minute'),
+    (14, 'old_second'),
+)
+
 # Fields only valid when rapid-acting-flag is "1"
 _ARRESULT_RAPID_INSULIN_ENTRY_MAP = (
     (43, 'double-rapid-acting-insulin'),
@@ -77,19 +86,19 @@ def _parse_record(record, entry_map):
         return {}
 
 
-def _extract_timestamp(parsed_record):
+def _extract_timestamp(parsed_record, prefix=''):
     """Extract the timestamp from a parsed record.
 
     This leverages the fact that all the records have the same base structure.
     """
 
     return datetime.datetime(
-        parsed_record['year'] + 2000,
-        parsed_record['month'],
-        parsed_record['day'],
-        parsed_record['hour'],
-        parsed_record['minute'],
-        parsed_record['second'])
+        parsed_record[prefix + 'year'] + 2000,
+        parsed_record[prefix + 'month'],
+        parsed_record[prefix + 'day'],
+        parsed_record[prefix + 'hour'],
+        parsed_record[prefix + 'minute'],
+        parsed_record[prefix + 'second'])
 
 
 def _convert_ketone_unit(raw_value):
@@ -110,10 +119,18 @@ def _parse_arresult(record):
     parsed_record = _parse_record(record, _BASE_ENTRY_MAP)
 
     # There are other record types, but we don't currently need to expose these.
-    if not parsed_record or parsed_record['type'] != 2:
+    if not parsed_record:
+        return None
+    elif parsed_record['type'] == 2:
+        parsed_record.update(_parse_record(record, _ARRESULT_TYPE2_ENTRY_MAP))
+    elif parsed_record['type'] == 5:
+        parsed_record.update(_parse_record(record, _ARRESULT_TYPE5_ENTRY_MAP))
+        return common.TimeAdjustment(
+            _extract_timestamp(parsed_record),
+            _extract_timestamp(parsed_record, 'old_'))
+    else:
         return None
 
-    parsed_record.update(_parse_record(record, _ARRESULT_TYPE2_ENTRY_MAP))
 
     # Check right away if we have rapid insulin
     if parsed_record['rapid-acting-flag']: