Update examples for changed/removed APIs, namely:

 to_string -> std::to_string
 system_time -> std::chrono

1 files changed, 4 insertions, 4 deletions

diff --git a/doc/examples/gen_certs.cpp b/doc/examples/gen_certs.cpp
index 80cb5f54a..557c6f46e 100644
--- a/doc/examples/gen_certs.cpp
+++ b/doc/examples/gen_certs.cpp
@@ -71,14 +71,14 @@ void save_pair(const std::string& name,
    key_out.close();
    }
 
+typedef std::chrono::duration<int, std::ratio<31556926>> years;
+
 int main()
    {
-   const u32bit seconds_in_a_year = 31556926;
-
-   const u32bit current_time = system_time();
+   auto current_time = std::chrono::system_clock::now();
 
    X509_Time now = X509_Time(current_time);
-   X509_Time later = X509_Time(current_time + 4*seconds_in_a_year);
+   X509_Time later = X509_Time(current_time + years(4));
 
    LibraryInitializer init;