core/SQLiteCommand: Make the DateTime serialization format a const

Author: oysteinkrog

src/SQLite.Net/SQLiteCommand.cs

@@ -39,6 +39,7 @@ public class SQLiteCommand
 
         private readonly SQLiteConnection _conn;
         private readonly ISQLitePlatform _sqlitePlatform;
+        private const string DateTimeFormat = "yyyy-MM-ddTHH:mm:ss.fffffffZ";
 
         internal SQLiteCommand(ISQLitePlatform platformImplementation, SQLiteConnection conn)
         {
@@ -349,7 +350,7 @@ internal static void BindParameter(ISQLiteApi isqLite3Api, IDbStatement stmt, in
                     }
                     else
                     {
-                        string val = ((DateTime) value).ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ss.fffffffZ", CultureInfo.InvariantCulture);
+                        string val = ((DateTime) value).ToUniversalTime().ToString(DateTimeFormat, CultureInfo.InvariantCulture);
                         isqLite3Api.BindText16(stmt, index, val, -1, NegativePointer);
                     }
                 }
@@ -366,7 +367,7 @@ internal static void BindParameter(ISQLiteApi isqLite3Api, IDbStatement stmt, in
                     }
                     else
                     {
-                        string val = ((ISerializable<DateTime>) value).Serialize().ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ss.fffffffZ", CultureInfo.InvariantCulture);
+                        string val = ((ISerializable<DateTime>) value).Serialize().ToUniversalTime().ToString(DateTimeFormat, CultureInfo.InvariantCulture);
                         isqLite3Api.BindText16(stmt, index, val, -1, NegativePointer);
                     }
                 }