How can I create a date stamp for yesterday

Question

I am trying to acquire the contents of the file with a datestamp in the file name for yesterday (WH.FBTBT20130214.csv). I created a date stamp variable for today but cannot

Answer 1

I found the answer. Just in case anyone is interested:

Set /A DateStamp=(%date:~10,4%%date:~4,2%%date:~7,2%)-1

echo DateStamp: %DateStamp%

Answer 2

You can't always just subtract 1 from the date and get yesterday's date. Say it's March 1. What's yesterday? March 0? Doesn't work that way. A better way is to use vbscript's Date() object and subtract a day from it.

@echo off
setlocal
REM ***** 20130215 MS Define DateStamp variable *****
echo d = DateAdd^("d", -1, Date^(^)^)>yesterday.vbs
echo wscript.echo DatePart^("yyyy", d^) ^& "/" ^& DatePart^("m", d^) ^& "/" ^& DatePart^("d", d^)>>yesterday.vbs
for /f "tokens=1-3 delims=/" %%I in ('cscript /nologo yesterday.vbs') do (
    set Year=%%I
    if %%J LEQ 9 (set Month=0%%J) else set Month=%%J
    if %%K LEQ 9 (set Day=0%%K) else set Day=%%K
)
set DateStamp=%Year%%Month%%Day%
del /q yesterday.vbs
echo %DateStamp%