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XP Date batch for previous day

Posted on 2008-10-03
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Last Modified: 2012-05-05
I currently have a batch file which gets the date and subtracts one day for file creation and directory creation but ran into the problem with the 1st day of month (1 - 1 = 0 of course) and its truncating the 01 of the day so instead of 03 for today's date it puts 3. Can someone help me with something that may work better, currently I'm using a set to grab portions of the date.
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Question by:nasteal
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6 Comments
 
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Expert Comment

by:devil_himself
ID: 22639814
do you want to subtract 1 day from the given input date or you want to find yesterdays date from the current system date.
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Author Comment

by:nasteal
ID: 22640040
Well I want to create a file with the previous day's date.
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devil_himself earned 2000 total points
ID: 22640183
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Author Comment

by:nasteal
ID: 22642875
What I have now is:

set YYMM=%date:~12,4%%date:~4,2%
set DD=%date:~7,2%
set /a PDD = %DD% - 1

Which gives me the problem described above.
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Author Comment

by:nasteal
ID: 22642986
That code will work however it sets

YYYYMMDD

I am unfamiliar with tokens in the for, but I need YYMMDD and not sure how to strip off the 20 portion, I tried at the last line of code "if %yy% LSS 100 set yy=20%yy%", however removing it the date still shows 2008. Thanks for pointing out that bit of code, I just need to figure out the portion to remove the "20"
@echo off 
setlocal 
call :get_date 
:: Strip leading zeros from possible octals and decrement the day 
set /a mm=1%mm%-100, dd=1%dd%-101 
if %dd% NEQ 0 goto :add_zeros 
:: Today is the 1st of the month - decrement the month 
:: and set leap year check (ignoring centuries) 
set /a mm-=1,ly=yy%%4 
:: If today is 1 Jan, set date to 31st Dec 
if %mm% EQU 0 (set /a dd=31, mm=12, yy-=1) else ( 
  rem Calculate days in last month (by Frank Westlake) 
  set /a "dd=5546>>mm&1,dd+=30" 
  rem Special case for February 
  if %mm% EQU 2 if %ly% EQU 0 (set dd=29) else (set dd=28) 
) 
:add_zeros 
if %dd% LSS 10 set dd=0%dd% 
if %mm% LSS 10 set mm=0%mm% 
echo yesterday was %yy%%mm%%dd% 
goto :eof 
 
 
:: ------------------------------------------------------------------ 
:Get_Date 
:: ------------------------------------------------------------------ 
:: Generic date parser 
:: Sets %dd% (01-31), %mm% (01-12) & %yy% (4 digit) 
 
 
if "%date%A" LSS "A" (set toks=1-3) else (set toks=2-4) 
for /f "skip=1 tokens=2-4 delims=(-)" %%a in ('echo:^|date') do ( 
  for /f "tokens=%toks% delims=.-/ " %%d in ('date/t') do ( 
    set %%a=%%d 
    set %%b=%%e 
    set %%c=%%f 
    set toks= 
  ) 
) 
if %yy% LSS 100 set yy=20%yy% 
goto :eof 

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Assisted Solution

by:devil_himself
devil_himself earned 2000 total points
ID: 22643002
change line 20

echo yesterday was %yy%%mm%%dd%

to

echo yesterday was %yy:~2%%mm%%dd%
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