diff -urN libbobcat/bobcat/datetime/datetime.orig libbobcat/bobcat/datetime/datetime
--- libbobcat/bobcat/datetime/datetime.orig	2023-09-15 19:46:37.003566700 +0200
+++ libbobcat/bobcat/datetime/datetime	2023-09-15 20:19:17.193432700 +0200
@@ -8,6 +8,7 @@
 #include <chrono>
 #include <mutex>
 #include <memory>
+#include <string>
 
 namespace FBB
 {