SQL修改数据库的系统时间

1.启用sp_configure
-- To allow advanced options to be changed.
EXEC sp_configure 'show advanced options', 1
GO
-- To update the currently configured value for advanced options.
RECONFIGURE
GO
-- To enable the feature.
EXEC sp_configure 'xp_cmdshell', 1
GO
-- To update the currently configured value for this feature.
RECONFIGURE
GO

2.修改系统时间 
exec master..xp_cmdshell 'date 2008-10-23' 
exec master..xp_cmdshell 'time 11:30:15'