Time something real.

chrono_io.html

@@ -107,12 +107,15 @@ a library such as this.
 #include "chrono_io.h"
 #include <iostream>
 
+void f();
+
 int
 main()
 {
     using namespace date;
     using namespace std::chrono;
     auto t0 = steady_clock::now();
+    f();
     auto t1 = steady_clock::now();
     std::cout << t1 - t0 << '\n';
 }
@@ -126,7 +129,7 @@ for example:
 </p>
 
 <blockquote><pre>
-104ns
+682580ns
 </pre></blockquote>
 
 <p>
@@ -136,12 +139,13 @@ different units on your platform), and the output automatically changes units fo
 
 <blockquote><pre>
 auto t0 = system_clock::now();
+f();
 auto t1 = system_clock::now();
 std::cout &lt;&lt; t1 - t0 &lt;&lt; '\n';
 </pre></blockquote>
 
 <blockquote><pre>
-0&micro;s
+682&micro;s
 </pre></blockquote>
 
 <p>