Fix formatting of dates

Redression after commit 81e1e0a2a6
(Refactor SbxValue::Format, 2024-09-13).

Change-Id: Ie7eb50c32f3c1a3aec73fc882dc33cce42734747
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173449
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

basic/qa/basic_coverage/test_format_function.bas

@@ -0,0 +1,27 @@
+'
+' This file is part of the LibreOffice project.
+'
+' This Source Code Form is subject to the terms of the Mozilla Public
+' License, v. 2.0. If a copy of the MPL was not distributed with this
+' file, You can obtain one at http://mozilla.org/MPL/2.0/.
+'
+
+Option Explicit
+
+Function doUnitTest as String
+    TestUtil.TestInit
+    verify_testFormat
+    doUnitTest = TestUtil.GetResult()
+End Function
+
+Sub verify_testFormat
+    On Error GoTo errorHandler
+
+    Dim d As Date
+    d = "2024-09-16 17:03:30"
+    TestUtil.AssertEqual(Format(d, "YYYY-MM-DD"), "2024-09-16", "Format(d, ""YYYY-MM-DD"")")
+
+    Exit Sub
+errorHandler:
+    TestUtil.ReportErrorHandler("verify_testFormat", Err, Error$, Erl)
+End Sub

basic/source/sbx/sbxscan.cxx

@@ -550,6 +550,7 @@ bool GetNumberIntl(const SbxValue& val, double& ret)
         case SbxUINT:
         case SbxSINGLE:
         case SbxDOUBLE:
+        case SbxDATE:
             ret = val.GetDouble();
             return true;
         case SbxSTRING: