Reduce flakiness of flag setting

SabreTools.FileTypes/BaseArchive.cs

@@ -7,15 +7,15 @@ namespace SabreTools.FileTypes
     {
         #region Fields
 
-        /// <summary>
-        /// Determines if dates are read or written
-        /// </summary>
-        public bool UseDates { get; set; } = false;
-
         #endregion
 
         #region Protected instance variables
 
+        /// <summary>
+        /// Determines if real dates are written
+        /// </summary>
+        protected bool _realDates = false;
+
         /// <summary>
         /// Buffer size used by archives
         /// </summary>
@@ -68,6 +68,14 @@ namespace SabreTools.FileTypes
 
         #region Writing
 
+        /// <summary>
+        /// Set if real dates are written
+        /// </summary>
+        public void SetRealDates(bool realDates)
+        {
+            _realDates = realDates;
+        }
+
         /// <inheritdoc/>
         public override abstract bool Write(string inputFile, string outDir, BaseFile? baseFile);