Support for isc_info_creation_date (#990).

Author: cincuranet

Provider/src/FirebirdSql.Data.FirebirdClient/Common/IscHelper.cs

@@ -130,6 +130,12 @@ public static List<object> ParseDatabaseInfo(byte[] buffer)
 						}
 						break;
 
+					case IscCodes.isc_info_creation_date:
+						var date = TypeDecoder.DecodeDate((int)VaxInteger(buffer, pos, 4));
+						var time = TypeDecoder.DecodeTime((int)VaxInteger(buffer, pos + 4, 4));
+						info.Add(date.Add(time));
+						break;
+
 					default:
 						throw new ArgumentOutOfRangeException(nameof(type), $"{nameof(type)}={type}");
 				}

Provider/src/FirebirdSql.Data.FirebirdClient/FirebirdClient/FbDatabaseInfo.cs

@@ -386,6 +386,15 @@ public Task<string> GetCryptPluginAsync(CancellationToken cancellationToken = de
 			return GetValueAsync<string>(IscCodes.fb_info_crypt_plugin, cancellationToken);
 		}
 
+		public DateTime GetCreationDate()
+		{
+			return GetValue<DateTime>(IscCodes.isc_info_creation_date);
+		}
+		public Task<DateTime> GetCreationDateAsync(CancellationToken cancellationToken = default)
+		{
+			return GetValueAsync<DateTime>(IscCodes.isc_info_creation_date, cancellationToken);
+		}
+
 		#endregion
 
 		#region Constructors