@echo off
set /a y = %date:~0,4%
if %date:~5,1% EQU 0 set /a m = %date:~6,1%
if %date:~5,1% NEQ 0 set /a m = %date:~5,2%
if %date:~8,1% EQU 0 set /a d = %date:~9,1%
if %date:~9,1% NEQ 0 set /a d = %date:~8,2%
if %m% EQU 1 set /a m = 13
if %m% EQU 2 set /a m = 14
set /a w = (d + 2*m+3*(m+1)/5+y+y/4-y/100+y/400) - ((d + 2*m+3*(m+1)/5+y+y/4-y/100+y/400)/7)*7 + 1
set /a yy = (y - 4*(y/4))
if %m% EQU 13 if %yy% EQU 0 set /a w = w -2
if %m% EQU 14 if %yy% EQU 0 set /a w = w -2
if %m% EQU 13 if %yy% NEQ 0 set /a w = w - 1
if %m% EQU 14 if %yy% NEQ 0 set /a w = w - 1
if %w% EQU -1 set /a w = 6
if %w% EQU 0 set /a w = 7
@echo %w%
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