Fix issue #421.

chenshuo · chenshuo · commit b55b0ac6a10d · 2020-04-28T13:14:27.000-07:00
diff --git a/muduo/base/Date.cc b/muduo/base/Date.cc
@@ -5,6 +5,7 @@
 
 #include "muduo/base/Date.h"
 #include <stdio.h>  // snprintf
+#include <time.h>  // struct tm
 
 namespace muduo
 {
