SQL Server - Getting current DATE and Time in SQL

Hello every one, Can we have function in MSSQL for getting current date and time,else using getdate() because it fetch our system date and time which can be changed. So i want to fetch current date and time in sql which cannot change,.

SQL Server's time is taken from the system.  It does not have one of its own.

this is my question.how can i get correct date and time in Sql with out fetching the system time by using getdate(). Because system time can be change.

Everything that gets the current date/time gets it from the local system time.  If you are worried about the system time being changed, then you'll have to write code that gets the datetime from a remote source that you trust won't change.