算 2008/11/28 的指令
date --date="20081128" +%U
所以 4gl 能不能直接調用 Linux date 的指令幫忙算出 ISO 8601 的週數?
當然能......
http://www.linuxfocus.org/~katja/toolbox/calendar.html
%U
week number of year with Sunday as first day of week (00..53)
%V
week number of year with Monday as first day of week (01..53)
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