1 files changed, 48 insertions, 0 deletions

diff --git a/src/WixToolset.Core.Native/DateTimeInterop.cs b/src/WixToolset.Core.Native/DateTimeInterop.cs
new file mode 100644
index 00000000..d2a0ba2b
--- /dev/null
+++ b/src/WixToolset.Core.Native/DateTimeInterop.cs
@@ -0,0 +1,48 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Core.Native
+{
+    using System;
+    using System.Runtime.InteropServices;
+
+    /// <summary>
+    /// Interop class for the date/time handling.
+    /// </summary>
+    internal static class DateTimeInterop
+    {
+        /// <summary>
+        /// Converts DateTime to MS-DOS date and time which cabinet uses.
+        /// </summary>
+        /// <param name="dateTime">DateTime</param>
+        /// <param name="cabDate">MS-DOS date</param>
+        /// <param name="cabTime">MS-DOS time</param>
+        public static void DateTimeToCabDateAndTime(DateTime dateTime, out ushort cabDate, out ushort cabTime)
+        {
+            // dateTime.ToLocalTime() does not match FileTimeToLocalFileTime() for some reason.
+            // so we need to call FileTimeToLocalFileTime() from kernel32.dll.
+            long filetime = dateTime.ToFileTime();
+            long localTime = 0;
+            FileTimeToLocalFileTime(ref filetime, ref localTime);
+            FileTimeToDosDateTime(ref localTime, out cabDate, out cabTime);
+        }
+
+        /// <summary>
+        /// Converts file time to a local file time.
+        /// </summary>
+        /// <param name="fileTime">file time</param>
+        /// <param name="localTime">local file time</param>
+        /// <returns>true if successful, false otherwise</returns>
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern bool FileTimeToLocalFileTime(ref long fileTime, ref long localTime);
+
+        /// <summary>
+        /// Converts file time to a MS-DOS time.
+        /// </summary>
+        /// <param name="fileTime">file time</param>
+        /// <param name="wFatDate">MS-DOS date</param>
+        /// <param name="wFatTime">MS-DOS time</param>
+        /// <returns>true if successful, false otherwise</returns>
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern bool FileTimeToDosDateTime(ref long fileTime, out ushort wFatDate, out ushort wFatTime);
+    }
+}