diff --git a/rtl/objpas/sysutils/dati.inc b/rtl/objpas/sysutils/dati.inc
index f8dc293dd1..efa351d2c6 100644
--- a/rtl/objpas/sysutils/dati.inc
+++ b/rtl/objpas/sysutils/dati.inc
@@ -712,14 +712,14 @@ function StrToTime(const S: PChar; Len : integer; FormatSettings : TFormatSettin
 Var
   Msg : AnsiString;
 begin
-  Result:=IntStrToTime(Msg,S,Len,FormatSettings,Separator);
+  Result:=IntStrToTime(Msg,S,Len,FormatSettings,#0);
   If (Msg<>'') then
     Raise EConvertError.Create(Msg);
 end;
 
 function StrToTime(const S: string; FormatSettings : TFormatSettings): TDateTime;
 begin
-  Result := StrToTime(@S[1], length(S), FormatSettings, #0);
+  Result := StrToTime(@S[1], length(S), FormatSettings);
 end;
 
 function StrToTime(const s: ShortString; separator : char): TDateTime;
@@ -764,42 +764,42 @@ begin
     Result:=StrToDate(S);
 end;
 
-function StrToDateTime(const s: AnsiString; const UseFormat : TFormatSettings): TDateTime;
+function StrToDateTime(const s: AnsiString; const FormatSettings : TFormatSettings): TDateTime;
 var
   I: integer;
 begin
-  I:=Pos(UseFormat.TimeSeparator,S);
+  I:=Pos(FormatSettings.TimeSeparator,S);
   If (I>0) then
     begin
     While (I>0) and (S[I]<>' ') do
       Dec(I);
     If I>0 then
-      result:=ComposeDateTime(StrToDate(Copy(S,1,I-1),UseFormat.ShortDateFormat,UseFormat.DateSeparator),
-                              StrToTime(Copy(S,i+1, Length(S)-i),UseFormat.TimeSeparator))
+      result:=ComposeDateTime(StrToDate(Copy(S,1,I-1),FormatSettings.ShortDateFormat,FormatSettings.DateSeparator),
+                              StrToTime(Copy(S,i+1, Length(S)-i),FormatSettings))
     else
-      result:=StrToTime(S,UseFormat.TimeSeparator)
+      result:=StrToTime(S,FormatSettings)
     end
   else
-    Result:=StrToDate(S,UseFormat.ShortDateFormat,UseFormat.DateSeparator);
+    Result:=StrToDate(S,FormatSettings.ShortDateFormat,FormatSettings.DateSeparator);
 end;
 
-function StrToDateTime(const s: ShortString; const UseFormat : TFormatSettings): TDateTime;
+function StrToDateTime(const s: ShortString; const FormatSettings : TFormatSettings): TDateTime;
 var
   I: integer;
 begin
-  I:=Pos(UseFormat.TimeSeparator,S);
+  I:=Pos(FormatSettings.TimeSeparator,S);
   If (I>0) then
     begin
     While (I>0) and (S[I]<>' ') do
       Dec(I);
     If I>0 then
-      result:=ComposeDateTime(StrToDate(Copy(S,1,I-1),UseFormat.ShortDateFormat,UseFormat.DateSeparator),
-                              StrToTime(Copy(S,i+1, Length(S)-i),UseFormat.TimeSeparator))
+      result:=ComposeDateTime(StrToDate(Copy(S,1,I-1),FormatSettings.ShortDateFormat,FormatSettings.DateSeparator),
+                              StrToTime(Copy(S,i+1, Length(S)-i),FormatSettings.TimeSeparator))
     else
-      result:=StrToTime(S,UseFormat.TimeSeparator)
+      result:=StrToTime(S,FormatSettings.TimeSeparator)
     end
   else
-    Result:=StrToDate(S,UseFormat.ShortDateFormat,UseFormat.DateSeparator);
+    Result:=StrToDate(S,FormatSettings.ShortDateFormat,FormatSettings.DateSeparator);
 end;
 
 {   FormatDateTime formats DateTime to the given format string FormatStr   }
diff --git a/rtl/objpas/sysutils/datih.inc b/rtl/objpas/sysutils/datih.inc
index 335eaad42c..b71daa0e04 100644
--- a/rtl/objpas/sysutils/datih.inc
+++ b/rtl/objpas/sysutils/datih.inc
@@ -142,8 +142,8 @@ function StrToDate(const S: AnsiString; const useformat : string; separator : ch
 function StrToTime(const S: PChar; Len : integer; separator : char = #0): TDateTime;
 function StrToDate(const S: PChar; Len : integer; const useformat : string; separator : char = #0): TDateTime;
 function StrToDateTime(const S: string): TDateTime;
-function StrToDateTime(const s: ShortString; const UseFormat : TFormatSettings): TDateTime;
-function StrToDateTime(const s: AnsiString; const UseFormat : TFormatSettings): TDateTime;
+function StrToDateTime(const s: ShortString; const Formatsettings : TFormatSettings): TDateTime;
+function StrToDateTime(const s: AnsiString; const Formatsettings : TFormatSettings): TDateTime;
 function FormatDateTime(const FormatStr: string; DateTime: TDateTime):string;
 function FormatDateTime(const FormatStr: string; DateTime: TDateTime; const FormatSettings: TFormatSettings): string;
 procedure DateTimeToString(out Result: string; const FormatStr: string; const DateTime: TDateTime);