diff -Naur clucene-core-2.3.3.4/src/core/CLucene/document/DateTools.cpp clucene-core-2.3.3.4.new/src/core/CLucene/document/DateTools.cpp
--- clucene-core-2.3.3.4/src/core/CLucene/document/DateTools.cpp	2011-03-17 03:21:07.000000000 +0300
+++ clucene-core-2.3.3.4.new/src/core/CLucene/document/DateTools.cpp	2020-02-21 15:20:17.382575302 +0300
@@ -9,6 +9,8 @@
 #include "DateTools.h"
 #include "CLucene/util/Misc.h"
 
+#include <ctime>
+
 CL_NS_USE(util)
 CL_NS_DEF(document)