diff --git a/fpdfsdk/fpdf_editpage.cpp b/fpdfsdk/fpdf_editpage.cpp
index dcb3d5e..585e7e1 100644
--- a/fpdfsdk/fpdf_editpage.cpp
+++ b/fpdfsdk/fpdf_editpage.cpp
@@ -164,7 +164,7 @@
   ByteString DateStr;
   if (FSDK_IsSandBoxPolicyEnabled(FPDF_POLICY_MACHINETIME_ACCESS)) {
     if (FXSYS_time(&currentTime) != -1) {
-      tm* pTM = localtime(&currentTime);
+      tm* pTM = FXSYS_localtime(&currentTime);
       if (pTM) {
         DateStr = ByteString::Format(
             "D:%04d%02d%02d%02d%02d%02d", pTM->tm_year + 1900, pTM->tm_mon + 1,
diff --git a/fpdfsdk/fpdf_ext.cpp b/fpdfsdk/fpdf_ext.cpp
index 1ff27cc..9f7b24b 100644
--- a/fpdfsdk/fpdf_ext.cpp
+++ b/fpdfsdk/fpdf_ext.cpp
@@ -83,6 +83,11 @@
   FXSYS_SetTimeFunction(func);
 }
 
+FPDF_EXPORT void FPDF_CALLCONV
+FSDK_SetLocaltimeFunction(struct tm* (*func)(const time_t* tp)) {
+  FXSYS_SetLocaltimeFunction(func);
+}
+
 FPDF_EXPORT int FPDF_CALLCONV FPDFDoc_GetPageMode(FPDF_DOCUMENT document) {
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   if (!pDoc)
diff --git a/fpdfsdk/fpdf_view_c_api_test.c b/fpdfsdk/fpdf_view_c_api_test.c
index ab184cc..9cf0376 100644
--- a/fpdfsdk/fpdf_view_c_api_test.c
+++ b/fpdfsdk/fpdf_view_c_api_test.c
@@ -216,6 +216,7 @@
 
     // fpdf_ext.h
     CHK(FPDFDoc_GetPageMode);
+    CHK(FSDK_SetLocaltimeFunction);
     CHK(FSDK_SetTimeFunction);
     CHK(FSDK_SetUnSpObjProcessHandler);