fix: Manually remove nanoseconds in datetime string with python < 3.11

Fix #10

vulnerabilitylookup/helpers.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+import re
 import sys
 import configparser
 
@@ -10,9 +11,16 @@
 
 
 def fromisoformat_wrapper(date_iso: str, /) -> datetime:
-    # Python < 3.11 cannot load times with a Z instead of +00:00
-    if sys.version_info < (3, 11) and date_iso.endswith('Z'):
-        date_iso = date_iso.replace('Z', '+00:00')
+    if sys.version_info < (3, 11):
+        if date_iso.endswith('Z'):
+            # Python < 3.11 cannot load times with a Z instead of +00:00
+            date_iso = date_iso.replace('Z', '+00:00')
+
+        # Sometimes, the string also contains nanoseconds for no good reason, and it fails with python < 3.11
+        # Is is useless so we strip that.
+        frac_sec = re.findall(r'[.](\d+)', date_iso)
+        if frac_sec and len(frac_sec[0]) > 6:
+            date_iso = date_iso.replace(frac_sec[0], frac_sec[0][:6])
     return datetime.fromisoformat(date_iso)