diff --git a/lotuswordpro/inc/lwptools.hxx b/lotuswordpro/inc/lwptools.hxx
index a0ec4bae29cc..3013c20435da 100644
--- a/lotuswordpro/inc/lwptools.hxx
+++ b/lotuswordpro/inc/lwptools.hxx
@@ -101,8 +101,8 @@ public:
     static OUString convertToFileUrl(const OString& fileName);
     static OUString    DateTimeToOUString(const LtTm& dt);
 
-    static XFDateStyle* GetSystemDateStyle(bool bLongFormat);
-    static XFTimeStyle* GetSystemTimeStyle();
+    static std::unique_ptr<XFDateStyle> GetSystemDateStyle(bool bLongFormat);
+    static std::unique_ptr<XFTimeStyle> GetSystemTimeStyle();
 };
 
 inline double LwpTools::ConvertFromUnits(sal_Int32 nUnits)
diff --git a/lotuswordpro/source/filter/localtime.cxx b/lotuswordpro/source/filter/localtime.cxx
index 39b6e0212058..9532cbbdcba8 100644
--- a/lotuswordpro/source/filter/localtime.cxx
+++ b/lotuswordpro/source/filter/localtime.cxx
@@ -56,6 +56,7 @@
 #include <localtime.hxx>
 #include <limits.h>
 #include <unicode/timezone.h>
+#include <memory>
 
 const long DAY_SEC =24 * 60 * 60;
 const long YEAR_SEC = 365 * DAY_SEC;
@@ -174,9 +175,9 @@ bool LtgLocalTime(long rtime,LtTm& rtm)
 
     if ((rtime > 3 * DAY_SEC)&&(rtime < LONG_MAX - 3 * DAY_SEC))
     {
-        icu::TimeZone* pLocalZone = icu::TimeZone::createDefault();
+        std::unique_ptr<icu::TimeZone> pLocalZone(icu::TimeZone::createDefault());
         long offset = (pLocalZone->getRawOffset())/1000;
-        delete pLocalZone;
+        pLocalZone.reset();
         long ltime = rtime + offset;
         return LtgGmTime(ltime,rtm);
     }
diff --git a/lotuswordpro/source/filter/lwpfribmark.cxx b/lotuswordpro/source/filter/lwpfribmark.cxx
index 307b3e6f0df9..878b37d3d28e 100644
--- a/lotuswordpro/source/filter/lwpfribmark.cxx
+++ b/lotuswordpro/source/filter/lwpfribmark.cxx
@@ -398,11 +398,11 @@ void LwpFribField::RegisterDateTimeStyle(const OUString& sFormula)
     {
         if (sFormula == "%FLSystemShortDate")
         {
-            pDateStyle.reset( LwpTools::GetSystemDateStyle(false) );
+            pDateStyle = LwpTools::GetSystemDateStyle(false);
         }
         else if (sFormula == "%FLSystemLongDate")
         {
-            pDateStyle.reset( LwpTools::GetSystemDateStyle(true) );
+            pDateStyle = LwpTools::GetSystemDateStyle(true);
         }
         else if (sFormula == "%FLISODate1" || sFormula == "%FLYYYY/MM/DD" )
         {
@@ -868,7 +868,7 @@ void LwpFribField::RegisterDateTimeStyle(const OUString& sFormula)
     //TIME
         else if (sFormula == "%FLSystemTime")
         {
-            pTimeStyle.reset(LwpTools::GetSystemTimeStyle());
+            pTimeStyle = LwpTools::GetSystemTimeStyle();
         }
         else if (sFormula == "%FLISOTime1" || sFormula == "%FLH:mm:SS")
         {
@@ -1018,7 +1018,7 @@ void LwpFribField::RegisterDateTimeStyle(const OUString& sFormula)
     {
         if (sFormula == "%Da")
         {
-            pDateStyle.reset(LwpTools::GetSystemDateStyle(false));
+            pDateStyle = LwpTools::GetSystemDateStyle(false);
         }
         else if (sFormula == "%DB" || sFormula == "%Db")
         {
diff --git a/lotuswordpro/source/filter/lwptools.cxx b/lotuswordpro/source/filter/lwptools.cxx
index 0f5ae98e7496..bd8ad0e067ba 100644
--- a/lotuswordpro/source/filter/lwptools.cxx
+++ b/lotuswordpro/source/filter/lwptools.cxx
@@ -233,7 +233,7 @@ OUString LwpTools::DateTimeToOUString(const LtTm &dt)
 /**
  * @descr   get the system date format
 */
-XFDateStyle* LwpTools::GetSystemDateStyle(bool bLongFormat)
+std::unique_ptr<XFDateStyle> LwpTools::GetSystemDateStyle(bool bLongFormat)
 {
     icu::DateFormat::EStyle style;
     if (bLongFormat)
@@ -268,7 +268,7 @@ XFDateStyle* LwpTools::GetSystemDateStyle(bool bLongFormat)
     // we parse pattern string letter by letter and get the time format.
     UChar cSymbol;
     UChar cTmp;
-    XFDateStyle* pDateStyle = new XFDateStyle;
+    std::unique_ptr<XFDateStyle> pDateStyle(new XFDateStyle);
 
     for (int32_t i=0;i<nLengthNeed;)
     {
@@ -594,7 +594,6 @@ XFDateStyle* LwpTools::GetSystemDateStyle(bool bLongFormat)
             {
                 if ((cSymbol>='A' && cSymbol<='Z') || (cSymbol>='a' && cSymbol<='z') )
                 {
-                    delete pDateStyle;
                     return nullptr;
                 }
                 else//TEXT
@@ -628,7 +627,7 @@ XFDateStyle* LwpTools::GetSystemDateStyle(bool bLongFormat)
 /**
  * @descr   get the system time format
 */
-XFTimeStyle* LwpTools::GetSystemTimeStyle()
+std::unique_ptr<XFTimeStyle> LwpTools::GetSystemTimeStyle()
 {
     //1 get locale for system
     icu::Locale aLocale( LanguageTagIcu::getIcuLocale( Application::GetSettings().GetLanguageTag()));
@@ -658,7 +657,7 @@ XFTimeStyle* LwpTools::GetSystemTimeStyle()
     // for time format ,for there is not date info,we can only parse the letter representing time.
     UChar cSymbol;
     UChar cTmp;
-    XFTimeStyle* pTimeStyle = new XFTimeStyle;
+    std::unique_ptr<XFTimeStyle> pTimeStyle(new XFTimeStyle);
 
     for (int32_t i=0;i<nLengthNeed;)
     {
@@ -817,7 +816,6 @@ XFTimeStyle* LwpTools::GetSystemTimeStyle()
             {
                 if ((cSymbol>='A' && cSymbol<='Z') || (cSymbol>='a' && cSymbol<='z') )
                 {
-                    delete pTimeStyle;
                     return nullptr;
                 }
                 else//TEXT