Could not register -- is this a bug or a feature?

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https://bbs.archlinux.org – It does not look like timezone issue because of '-u' option for 'date'. From "man date" (GNU coreutils 8.5 February 2011):%W     week number of year, with Monday as first day of week (00..53)However I get:date -u +%W00Good thatinfo coreutils 'date invocation'has valuable addition:Days in a new year preceding the first Monday are  in week zero.So, it registration does not calculate correct week number. They probably do not use posted expression, or their tool uses is of different version. Probably this issue happens only at the beginni (HowTos)