Benchmark: timing 20000 iterations of POSIX, timelocal...
     POSIX:  1 wallclock secs ( 0.57 usr +  0.03 sys =  0.60 CPU) @ 33333.33/s (n=20000)
 timelocal:  6 wallclock secs ( 4.95 usr +  0.00 sys =  4.95 CPU) @ 4040.40/s (n=20000)
             Rate timelocal     POSIX
timelocal  4040/s        --      -88%
POSIX     33333/s      725%        --