1 files changed, 8 insertions, 3 deletions
diff --git a/doc/examples/ca.cpp b/doc/examples/ca.cpp
index 8dd3e981f..25a3b5a03 100644
--- a/doc/examples/ca.cpp
+++ b/doc/examples/ca.cpp
@@ -17,11 +17,11 @@
 
 #include <botan/botan.h>
 #include <botan/x509_ca.h>
-#include <botan/time.h>
 using namespace Botan;
 
 #include <iostream>
 #include <memory>
+#include <chrono>
 
 int main(int argc, char* argv[])
    {
@@ -58,8 +58,13 @@ int main(int argc, char* argv[])
       // (this example should be extended to show how)
 
       // now sign the request
-      X509_Time start_time(system_time());
-      X509_Time end_time(system_time() + 365 * 60 * 60 * 24);
+      auto now = std::chrono::system_clock::now();
+
+      X509_Time start_time(now);
+
+      typedef std::chrono::duration<int, std::ratio<31556926>> years;
+
+      X509_Time end_time(now + years(1));
 
       X509_Certificate new_cert = ca.sign_request(req, rng,
                                                   start_time, end_time);