Updated Examples and Recipes (markdown)

Examples-and-Recipes.md

@@ -2248,6 +2248,37 @@ tzdb_manager(std::atomic<bool>& run)
     }
 }
 ```
+The above assumes a build with `DAUTO_DOWNLOAD=0`.  That is, the tz lib won't automatically download the IANA tzdb for you.  If you want to build with `DAUTO_DOWNLOAD=1` (which is the default on macOS and Linux), the code above can be simplified a bit by changing:
+
+```c++
+        auto rv = remote_version();
+        if (rv != get_tzdb().version)
+        {
+            // download, install and load the new tzdb
+            if (remote_download(rv))
+            {
+                if (remote_install(rv))
+                {
+                    reload_tzdb();
+                    // Schedule cleanup of the old tzdb for 10 days from now
+                    clean_at = check_at + days{10};
+                }
+            }
+            // if anything failed, we just try again tomorrow morning
+        }
+```
+to
+```c++
+        auto rv = remote_version();
+        if (rv != get_tzdb().version)
+        {
+            // download, install and load the new tzdb
+            reload_tzdb();
+            // Schedule cleanup of the old tzdb for 10 days from now
+            clean_at = check_at + days{10};
+            // if anything failed, we just try again tomorrow morning
+        }
+```
 
 It isn't the most friendly code to have to write.  But on the other hand, it gives you complete discretion on your `tzdb` delete policy and doesn't penalize clients that have no need to update their `tzdb` database.