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                  Rate   str2time split_nocheck BrowserUk2  BrowserUk 
+  inline_c
str2time       16534/s         --          -87%       -93%       -93% 
+      -97%
split_nocheck 127292/s       670%            --       -44%       -45% 
+      -74%
BrowserUk2    227574/s      1276%           79%         --        -2% 
+      -53%
BrowserUk     231067/s      1297%           82%         2%         -- 
+      -52%
inline_c      485678/s      2837%          282%       113%       110% 
+        --

use Benchmark qw/cmpthese/;
use Date::Parse; # str2time
use Time::Local qw/timegm_nocheck/;
...

    inline_c => sub { epoch_sec($date) },
});