The constants for BrowserUk are wrong. They should be: 
use constant MONTHS => { qw[
    Jan 0 Feb 31 Mar 59 Apr 90 May 120 Jun 151
    Jul 181 Aug 212 Sep 243 Oct 273 Nov 304 Dec 334
] };

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In reply to Re^2: High-speed Date Formatting by erh
in thread *SOLVED* High-speed Date Formatting by Endless

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