diff --git a/reactos/dll/cpl/timedate/dateandtime.c b/reactos/dll/cpl/timedate/dateandtime.c
index 064516d7da3..ac5f884b1c8 100644
--- a/reactos/dll/cpl/timedate/dateandtime.c
+++ b/reactos/dll/cpl/timedate/dateandtime.c
@@ -289,7 +289,7 @@ DateTimePageProc(HWND hwndDlg,
             SendMessage(GetDlgItem(hwndDlg, IDC_YEAR), UDM_SETRANGE, 0, MAKELONG ((short) 9999, (short) 1900));
             SendMessage(GetDlgItem(hwndDlg, IDC_YEAR), UDM_SETPOS, 0, MAKELONG( (short) st.wYear, 0));
 
-            pOldWndProc = (WNDPROC) SetWindowLong(GetDlgItem(hwndDlg, IDC_TIMEPICKER), GWL_WNDPROC, (INT_PTR) DTPProc);
+            pOldWndProc = (WNDPROC) SetWindowLongPtr(GetDlgItem(hwndDlg, IDC_TIMEPICKER), GWL_WNDPROC, (INT_PTR) DTPProc);
         }
         break;
 
@@ -322,7 +322,7 @@ DateTimePageProc(HWND hwndDlg,
         case WM_CTLCOLORSTATIC:
         {
             if ((HWND) lParam == GetDlgItem(hwndDlg, IDC_YEARTEXT))
-                return (int) GetSysColorBrush(COLOR_WINDOW);
+                return (INT_PTR) GetSysColorBrush(COLOR_WINDOW);
 
         }
         break;
diff --git a/reactos/dll/cpl/timedate/monthcal.c b/reactos/dll/cpl/timedate/monthcal.c
index 6d76fd4b1aa..a226dc4f3f3 100644
--- a/reactos/dll/cpl/timedate/monthcal.c
+++ b/reactos/dll/cpl/timedate/monthcal.c
@@ -237,7 +237,7 @@ MonthCalReload(IN PMONTHCALWND infoPtr)
     TCHAR szBuf[64];
     UINT i;
 
-    infoPtr->UIState = SendMessage(GetAncestor(infoPtr->hSelf,
+    infoPtr->UIState = (DWORD) SendMessage(GetAncestor(infoPtr->hSelf,
                                                GA_PARENT),
                                    WM_QUERYUISTATE,
                                    0,
@@ -439,7 +439,7 @@ MonthCalPaint(IN PMONTHCALWND infoPtr,
               IN HDC hDC,
               IN LPRECT prcUpdate)
 {
-    UINT x, y;
+    LONG x, y;
     RECT rcCell;
     COLORREF crOldText, crOldCtrlText = CLR_INVALID;
     HFONT hOldFont;
@@ -993,7 +993,7 @@ MonthCalWndProc(IN HWND hwnd,
         {
             if (wParam == GWL_STYLE)
             {
-                BOOL OldEnabled = infoPtr->Enabled;
+                unsigned int OldEnabled = infoPtr->Enabled;
                 infoPtr->Enabled = !(((LPSTYLESTRUCT)lParam)->styleNew & WS_DISABLED);
 
                 if (OldEnabled != infoPtr->Enabled)
diff --git a/reactos/dll/cpl/timedate/timedate.c b/reactos/dll/cpl/timedate/timedate.c
index f942f243a2d..8bd4f4096a9 100644
--- a/reactos/dll/cpl/timedate/timedate.c
+++ b/reactos/dll/cpl/timedate/timedate.c
@@ -135,7 +135,7 @@ CPlApplet(HWND hwndCpl,
 }
 
 
-BOOL STDCALL
+BOOL WINAPI
 DllMain(HINSTANCE hinstDLL,
         DWORD dwReason,
         LPVOID lpReserved)