>>Do you know the exact formula?
>
>Not the exact formula, as it provides repeated results if called within the same millisecond (that is what I read in the thread, I have never tried this function myself) (my guess this is the old formula as sys(2015) was improved for VFP 9 or VFP 9 SP2, IIRC), but this guy wrote a similar one that apparently works:
>
>http://www.mrexcel.com/forum/excel-questions/77351-using-vfps-sys-2015-excel.html

No, SYS(2015) does NOT give repeated results within the same millisecond. I've run tests of 100,000 iterations and SYS(2015) was unique. It always has been. SYS(3), OTOH, does repeat within the same millisecond.

Tamar