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Benchmark: timing 5 iterations of FastMktime::caching_mktime, POSIX::m
+ktime, TIME::Local::timegm_nocheck...
FastMktime::caching_mktime: 120 wallclock secs (120.21 usr +  0.05 sys
+ = 120.26 CPU) @  0.04/s (n=5)
POSIX::mktime: 360 wallclock secs (165.42 usr + 193.81 sys = 359.23 CP
+U) @  0.01/s (n=5)
TIME::Local::timegm_nocheck: 293 wallclock secs (292.72 usr +  0.14 sy
+s = 292.86 CPU) @  0.02/s (n=5)

Benchmark: timing 5 iterations of FastMktime::caching_mktime, POSIX::m
+ktime, TIME::Local::timegm_nocheck...
FastMktime::caching_mktime: 65 wallclock secs (64.77 usr +  0.02 sys =
+ 64.79 CPU) @  0.08/s (n=5)
POSIX::mktime: 118 wallclock secs (58.16 usr + 60.47 sys = 118.63 CPU)
+ @  0.04/s (n=5)
TIME::Local::timegm_nocheck: 143 wallclock secs (143.07 usr +  0.54 sy
+s = 143.61 CPU) @  0.03/s (n=5)

#!/usr/bin/perl

...
    'TIME::Local::timegm_nocheck' => sub { $tmp = Time::Local::timegm_
+nocheck(@$_) for @dates },
    'FastMktime::caching_mktime' => sub { $tmp = FastMktime::caching_m
+ktime(@$_) for @dates },
});