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#!/usr/bin/perl -sw

...
Benchmark: timing 10000000 iterations of localtime, gmtime...
 localtime: 101 wallclock secs (51.07 usr + 45.89 sys = 96.96 CPU) @ 1
+03135.31/s (n=10000000)
    gmtime: 62 wallclock secs (29.76 usr + 27.94 sys = 57.70 CPU) @ 17
+3310.23/s (n=10000000)

#!/usr/bin/perl -sw

...
    timegm: 95 wallclock secs (89.95 usr +  0.06 sys = 90.01 CPU) @ 11
+1098.77/s (n=10000000)
 timelocal: 811 wallclock secs (654.30 usr + 112.15 sys = 766.45 CPU) 
+@ 13047.17/s (n=10000000)