Fix UTF-8 handling in python

wgmaster/import.py

@@ -1,4 +1,5 @@
 #!/bin/env python3
+# -*- coding: utf-8 -*-
 
 from typing import List, Optional
 import argparse
@@ -74,8 +75,8 @@ if __name__ == '__main__':
         except FileNotFoundError:
             pass
 
-    sqlite3.register_adapter(datetime.date, lambda d: str(d))
-    sqlite3.register_adapter(datetime.time, lambda t: str(t))
+    sqlite3.register_adapter(datetime.date, lambda d: d.strftime('%Y-%m-%d'))
+    sqlite3.register_adapter(datetime.time, lambda t: t.strftime('%H:%M:%S'))
 
     DB_CNX = sqlite3.connect(args.db)
     DB_CNX.create_function('REGEXP', 2, sqlite_regexp)