Can I create create a global function in SQL Server?

Question

Is it possible to create a function in SQL Server which I could use in any database on the server, without adding the database prefix?

For example, with this functio

Answer 1

Although creating stored procedures in master makes them globally available, this does not work for functions. You need to use the three-part naming convention:

select ..getDays(...)

Why would Microsoft make functions different from stored procedures?