@ECHO OFF set /A WEEK_YYYY=%DATE:~0,4% * 1 set WEEK_MM=%DATE:~5,2% if %WEEK_MM:~0,1%==0 ( set WEEK_MM=%WEEK_MM:~1,1% ) set /A WEEK_DD=%DATE:~8,2% * 1 rem 1月か2月なら年数を引いて月に12を足す ("ツェラーの公式"にて1月と2月は前年の13月と14月として扱う) if %WEEK_MM% LEQ 2 ( set /A WEEK_YYYY=%W…