diff --git a/include/tools/otherTools.h b/include/tools/otherTools.h
index 726c332b..4b7d2e18 100644
--- a/include/tools/otherTools.h
+++ b/include/tools/otherTools.h
@@ -45,6 +45,8 @@ namespace kiwix
 
   using MimeCounterType = std::map<const std::string, zim::entry_index_type>;
   MimeCounterType parseMimetypeCounter(const std::string& counterData);
+
+  std::string gen_date_str();
 }
 
 #endif
diff --git a/src/opds_dumper.cpp b/src/opds_dumper.cpp
index aff73898..2147e086 100644
--- a/src/opds_dumper.cpp
+++ b/src/opds_dumper.cpp
@@ -21,7 +21,6 @@
 #include "book.h"
 
 #include "tools/otherTools.h"
-#include <iomanip>
 
 namespace kiwix
 {
@@ -35,22 +34,6 @@ OPDSDumper::~OPDSDumper()
 {
 }
 
-std::string gen_date_str()
-{
-  auto now = time(0);
-  auto tm = localtime(&now);
-
-  std::stringstream is;
-  is << std::setw(2) << std::setfill('0')
-     << 1900+tm->tm_year << "-"
-     << std::setw(2) << std::setfill('0') << tm->tm_mon+1 << "-"
-     << std::setw(2) << std::setfill('0') << tm->tm_mday << "T"
-     << std::setw(2) << std::setfill('0') << tm->tm_hour << ":"
-     << std::setw(2) << std::setfill('0') << tm->tm_min << ":"
-     << std::setw(2) << std::setfill('0') << tm->tm_sec << "Z";
-  return is.str();
-}
-
 static std::string gen_date_from_yyyy_mm_dd(const std::string& date)
 {
   std::stringstream is;
diff --git a/src/tools/otherTools.cpp b/src/tools/otherTools.cpp
index b5db9d49..a51ed5ff 100644
--- a/src/tools/otherTools.cpp
+++ b/src/tools/otherTools.cpp
@@ -19,6 +19,7 @@
 
 #include "tools/otherTools.h"
 #include <algorithm>
+#include <iomanip>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -341,3 +342,19 @@ kiwix::MimeCounterType kiwix::parseMimetypeCounter(const std::string& counterDat
 
   return counters;
 }
+
+std::string kiwix::gen_date_str()
+{
+  auto now = std::time(0);
+  auto tm = std::localtime(&now);
+
+  std::stringstream is;
+  is << std::setw(2) << std::setfill('0')
+     << 1900+tm->tm_year << "-"
+     << std::setw(2) << std::setfill('0') << tm->tm_mon+1 << "-"
+     << std::setw(2) << std::setfill('0') << tm->tm_mday << "T"
+     << std::setw(2) << std::setfill('0') << tm->tm_hour << ":"
+     << std::setw(2) << std::setfill('0') << tm->tm_min << ":"
+     << std::setw(2) << std::setfill('0') << tm->tm_sec << "Z";
+  return is.str();
+}