Most programs should not use this directly, but it's exposed for those
few programs that need it.
The main reasons that a program might need to use ticks directly is if
the system clock has higher precision than hnsecs, and the program needs
that higher precision, or if the program needs to avoid the rounding
errors caused by converting to hnsecs.
The D Programming Language's Unofficial Docs
beta
The number of ticks in the monotonic time.
Most programs should not use this directly, but it's exposed for those few programs that need it.
The main reasons that a program might need to use ticks directly is if the system clock has higher precision than hnsecs, and the program needs that higher precision, or if the program needs to avoid the rounding errors caused by converting to hnsecs.