MSwindows

If you are forced to use MSwindows this may help

set now=%date:~<start>,<len>%

Get a substring from date

for /F %%i in (<filename>) do set var1=%%i

Read filename and set var1 to the content of the file

if %var1% == %var2% command

Execute command if var2 is equal to var1. if /I ignores case

if EXIST file1 ( commandblock )

Execute the commandblock if file1 exists

if ERRORLEVEL <num> ( command )

Commands return ERRORLEVEL as exist status. Execute command if the ERRORLEVEL matches <num>