Benchmark: timing 100000 iterations of Reference Implementation, Reverse Array, Shorter Array, strftime...
Reference Implementation:  1 wallclock secs ( 0.66 usr +  0.03 sys =  0.69 CPU) @ 144927.54/s (n=100000)
Reverse Array:  1 wallclock secs ( 0.85 usr +  0.03 sys =  0.88 CPU) @ 113636.36/s (n=100000)
Shorter Array:  0 wallclock secs ( 0.63 usr +  0.04 sys =  0.67 CPU) @ 149253.73/s (n=100000)
  strftime:  1 wallclock secs ( 0.52 usr +  0.07 sys =  0.59 CPU) @ 169491.53/s (n=100000)
                             Rate Reverse Array Reference Implementation Shorter Array strftime
Reverse Array            113636/s            --                     -22%          -24%     -33%
Reference Implementation 144928/s           28%                       --           -3%     -14%
Shorter Array            149254/s           31%                       3%            --     -12%
strftime                 169492/s           49%                      17%           14%       --