diff --git a/dlls/oledb32/convert.c b/dlls/oledb32/convert.c
index f6f72d0cb7c..c98d0b2d228 100644
--- a/dlls/oledb32/convert.c
+++ b/dlls/oledb32/convert.c
@@ -120,13 +120,19 @@ static int get_length(DBTYPE type)
     case DBTYPE_I2:
     case DBTYPE_UI2:
         return 2;
+    case DBTYPE_BOOL:
+	return sizeof(VARIANT_BOOL);
     case DBTYPE_I4:
     case DBTYPE_UI4:
     case DBTYPE_R4:
         return 4;
     case DBTYPE_I8:
     case DBTYPE_UI8:
+    case DBTYPE_R8:
+    case DBTYPE_DATE:
         return 8;
+    case DBTYPE_DBTIMESTAMP:
+	return sizeof(DBTIMESTAMP);
     case DBTYPE_CY:
         return sizeof(CY);
     case DBTYPE_BSTR:
@@ -299,6 +305,120 @@ static HRESULT WINAPI convert_DataConvert(IDataConvert* iface,
         }
         break;
     }
+    case DBTYPE_R8:
+    {
+        DOUBLE *d=dst;
+        switch (src_type)
+        {
+        case DBTYPE_EMPTY:      *d = 0; hr = S_OK;                               break;
+        case DBTYPE_I1:          hr = VarR8FromI1(*(signed char*)src, d);        break;
+        case DBTYPE_I2:          hr = VarR8FromI2(*(signed short*)src, d);       break;
+        case DBTYPE_I4:          hr = VarR8FromI4(*(signed int*)src, d);         break;
+        case DBTYPE_I8:          hr = VarR8FromI8(*(LONGLONG*)src, d);           break;
+        case DBTYPE_UI1:         hr = VarR8FromUI1(*(BYTE*)src, d);              break;
+        case DBTYPE_UI2:         hr = VarR8FromUI2(*(WORD*)src, d);              break;
+        case DBTYPE_UI4:         hr = VarR8FromUI4(*(DWORD*)src, d);             break;
+        case DBTYPE_UI8:         hr = VarR8FromUI8(*(ULONGLONG*)src, d);         break;
+        case DBTYPE_R4:          hr = VarR8FromR4(*(FLOAT*)src, d);              break;
+        case DBTYPE_R8:          *d = *(DOUBLE*)src; hr = S_OK;                  break;
+        case DBTYPE_CY:          hr = VarR8FromCy(*(CY*)src, d);                 break;
+        case DBTYPE_DATE:        hr = VarR8FromDate(*(DATE*)src, d);             break;
+        case DBTYPE_BSTR:        hr = VarR8FromStr(*(WCHAR**)src, LOCALE_USER_DEFAULT, 0, d); break;
+        case DBTYPE_BOOL:        hr = VarR8FromBool(*(VARIANT_BOOL*)src, d);     break;
+        case DBTYPE_DECIMAL:     hr = VarR8FromDec((DECIMAL*)src, d);            break;
+        default: FIXME("Unimplemented conversion %04x -> R8\n", src_type); return E_NOTIMPL;
+        }
+        break;
+    }
+    case DBTYPE_BOOL:
+    {
+        VARIANT_BOOL *d=dst;
+        switch (src_type)
+        {
+        case DBTYPE_EMPTY:      *d = 0; hr = S_OK;                               break;
+        case DBTYPE_I1:          hr = VarBoolFromI1(*(signed char*)src, d);      break;
+        case DBTYPE_I2:          hr = VarBoolFromI2(*(signed short*)src, d);     break;
+        case DBTYPE_I4:          hr = VarBoolFromI4(*(signed int*)src, d);       break;
+        case DBTYPE_I8:          hr = VarBoolFromI8(*(LONGLONG*)src, d);         break;
+        case DBTYPE_UI1:         hr = VarBoolFromUI1(*(BYTE*)src, d);            break;
+        case DBTYPE_UI2:         hr = VarBoolFromUI2(*(WORD*)src, d);            break;
+        case DBTYPE_UI4:         hr = VarBoolFromUI4(*(DWORD*)src, d);           break;
+        case DBTYPE_UI8:         hr = VarBoolFromUI8(*(ULONGLONG*)src, d);       break;
+        case DBTYPE_R4:          hr = VarBoolFromR4(*(FLOAT*)src, d);            break;
+        case DBTYPE_R8:          hr = VarBoolFromR8(*(DOUBLE*)src, d);           break;
+        case DBTYPE_CY:          hr = VarBoolFromCy(*(CY*)src, d);               break;
+        case DBTYPE_DATE:        hr = VarBoolFromDate(*(DATE*)src, d);           break;
+        case DBTYPE_BSTR:        hr = VarBoolFromStr(*(WCHAR**)src, LOCALE_USER_DEFAULT, 0, d); break;
+        case DBTYPE_BOOL:        *d = *(VARIANT_BOOL*)src; hr = S_OK;            break;
+        case DBTYPE_DECIMAL:     hr = VarBoolFromDec((DECIMAL*)src, d);          break;
+        default: FIXME("Unimplemented conversion %04x -> BOOL\n", src_type); return E_NOTIMPL;
+        }
+        break;
+    }
+    case DBTYPE_DATE:
+    {
+        DATE *d=dst;
+        switch (src_type)
+        {
+        case DBTYPE_EMPTY:      *d = 0; hr = S_OK;                           	 break;
+        case DBTYPE_I1:          hr = VarDateFromI1(*(signed char*)src, d);      break;
+        case DBTYPE_I2:          hr = VarDateFromI2(*(signed short*)src, d);     break;
+        case DBTYPE_I4:          hr = VarDateFromI4(*(signed int*)src, d);       break;
+        case DBTYPE_I8:          hr = VarDateFromI8(*(LONGLONG*)src, d);         break;
+        case DBTYPE_UI1:         hr = VarDateFromUI1(*(BYTE*)src, d);            break;
+        case DBTYPE_UI2:         hr = VarDateFromUI2(*(WORD*)src, d);            break;
+        case DBTYPE_UI4:         hr = VarDateFromUI4(*(DWORD*)src, d);           break;
+        case DBTYPE_UI8:         hr = VarDateFromUI8(*(ULONGLONG*)src, d);       break;
+        case DBTYPE_R4:          hr = VarDateFromR4(*(FLOAT*)src, d);            break;
+        case DBTYPE_R8:          hr = VarDateFromR8(*(DOUBLE*)src, d);           break;
+        case DBTYPE_CY:          hr = VarDateFromCy(*(CY*)src, d);               break;
+        case DBTYPE_DATE:       *d = *(DATE*)src;      hr = S_OK;                break;
+        case DBTYPE_BSTR:        hr = VarDateFromStr(*(WCHAR**)src, LOCALE_USER_DEFAULT, 0, d); break;
+        case DBTYPE_BOOL:        hr = VarDateFromBool(*(VARIANT_BOOL*)src, d);   break;
+        case DBTYPE_DECIMAL:     hr = VarDateFromDec((DECIMAL*)src, d);          break;
+        case DBTYPE_DBTIMESTAMP:
+        {
+            SYSTEMTIME st;
+            DBTIMESTAMP *ts=(DBTIMESTAMP*)src;
+
+            st.wYear = ts->year;
+            st.wMonth = ts->month;
+            st.wDay = ts->day;
+            st.wHour = ts->hour;
+            st.wMinute = ts->minute;
+            st.wSecond = ts->second;
+            st.wMilliseconds = ts->fraction/1000000;
+            hr = (SystemTimeToVariantTime(&st, d) ? S_OK : E_FAIL);
+            break;
+        }
+        default: FIXME("Unimplemented conversion %04x -> DATE\n", src_type); return E_NOTIMPL;
+        }
+        break;
+    }
+    case DBTYPE_DBTIMESTAMP:
+    {
+        DBTIMESTAMP *d=dst;
+        switch (src_type)
+        {
+	case DBTYPE_EMPTY:       memset(d, 0, sizeof(DBTIMESTAMP));    hr = S_OK; break;
+	case DBTYPE_DBTIMESTAMP: memcpy(d, src, sizeof(DBTIMESTAMP));  hr = S_OK; break;
+        case DBTYPE_DATE:
+        {
+            SYSTEMTIME st;
+            hr = (VariantTimeToSystemTime(*(double*)src, &st) ? S_OK : E_FAIL);
+            d->year = st.wYear;
+            d->month = st.wMonth;
+            d->day = st.wDay;
+            d->hour = st.wHour;
+            d->minute = st.wMinute;
+            d->second = st.wSecond;
+            d->fraction = st.wMilliseconds * 1000000;
+            break;
+        }
+        default: FIXME("Unimplemented conversion %04x -> DBTIMESTAMP\n", src_type); return E_NOTIMPL;
+        }
+        break;
+    }
 
     case DBTYPE_CY:
     {
diff --git a/include/oledb.idl b/include/oledb.idl
index 127df2b4906..48411651c55 100644
--- a/include/oledb.idl
+++ b/include/oledb.idl
@@ -40,6 +40,15 @@ typedef ULONG DBREFCOUNT;
 typedef ULONG DB_UPARAMS;
 typedef LONG  DB_LPARAMS;
 typedef DWORD DBHASHVALUE;
+typedef struct {
+    SHORT year;
+    USHORT month;
+    USHORT day;
+    USHORT hour;
+    USHORT minute;
+    USHORT second;
+    ULONG fraction;
+} DBTIMESTAMP;
 
 #include "dbs.idl"