RFC&BAPI for timestamp

Hi, everyone.

I need to get a timestamp of the sever.

I know I can achieve it as following:

GET TIME STAMP FIELD s_tst.

But according to the requirement, the third party one need this timestamp. So I need a RFC & BAPI, which can return the timestamp for the caller.

I know, I can create a RFC & BAPI by myself, but my question: is there any exists BAPI & RFC which can achieve my target?

Any reply is welcome.

Hope your reply, thanks a lot