diff --git a/aprslib/parsing/common.py b/aprslib/parsing/common.py
index 185215b..dd8d9cd 100644
--- a/aprslib/parsing/common.py
+++ b/aprslib/parsing/common.py
@@ -99,7 +99,8 @@ def parse_timestamp(body, packet_type=''):
                 else:
                     timestamp = "19700101000000"
 
-                timestamp = int((utc.strptime(timestamp, "%Y%m%d%H%M%S") - datetime(1970, 1, 1)).total_seconds())
+                td = utc.strptime(timestamp, "%Y%m%d%H%M%S") - datetime(1970, 1, 1)
+                timestamp = int((td.microseconds + (td.seconds + td.days * 24 * 3600) * 10**6) / 10**6)
             except Exception as exp:
                 timestamp = 0
                 logger.debug(exp)
diff --git a/tests/test_parse_common.py b/tests/test_parse_common.py
index fc4c84a..64190dc 100644
--- a/tests/test_parse_common.py
+++ b/tests/test_parse_common.py
@@ -179,7 +179,8 @@ class TimestampTC(unittest.TestCase):
 
     def test_timestamp_valid(self):
         date = datetime.utcnow()
-        timestamp = int((date - datetime(1970, 1, 1)).total_seconds())
+        td = date - datetime(1970, 1, 1)
+        timestamp = int((td.microseconds + (td.seconds + td.days * 24 * 3600) * 10**6) / 10**6)
 
         # hhmmss format
         body = date.strftime("%H%M%Shtext")