Document chrono

doc/api.rst

@@ -415,18 +415,15 @@ For example::
 
   #include <fmt/chrono.h>
 
-  int main() {
-    using namespace std::literals::chrono_literals;
-    fmt::print("Default format: {} {}\n", 42s, 100ms);
-    fmt::print("strftime-like format: {:%H:%M:%S}\n", 3h + 15min + 30s);
-  }
+  std::time_t t = std::time(nullptr);
+  // Prints "The date is 2020-11-07." (with the current date):
+  fmt::print("The date is {:%Y-%m-%d}.", fmt::localtime(t));
 
-prints:
-
-.. code:: none
-
-   Default format: 42s 100ms
-   strftime-like format: 03:15:30
+  using namespace std::literals::chrono_literals;
+  // Prints "Default format: 42s 100ms":
+  fmt::print("Default format: {} {}\n", 42s, 100ms);
+  // Prints "strftime-like format: 03:15:30":
+  fmt::print("strftime-like format: {:%H:%M:%S}\n", 3h + 15min + 30s);
 
 Chrono format specifications are described in :ref:`chrono-specs`.