Updated Examples and Recipes (markdown)

Examples-and-Recipes.md

@@ -13,7 +13,10 @@ using namespace std::chrono;
 using namespace date;
 // Component values (as obtained from an UI form, for example)
 int y=2015, m=7, d=30, h=12, min=34, s=56;
-system_clock::time_point = day_point(year(y)/m/d) +
+auto ymd = year(y)/m/d; // Yields a year_month_day type
+if (!ymd.ok())
+    throw std::runtime_error("Invalid date");
+system_clock::time_point = day_point(ymd) +
                            hours(h) + minutes(min) + seconds(s);
 ```