windows下批处理，取昨天的时间

@echo off
setlocal EnableDelayedExpansion

echo Generate last datetime...

set TodayYear=%date:~0,4%
set TodayMon=%date:~5,2%
set TodayDay=%date:~8,2%
if "!TodayDay!" == "08" set TodayDay=8
if "!TodayDay!" == "09" set TodayDay=9

set LastdayYear=
set LastdayMon=
set LastdayDay=

set LastdayYear=%TodayYear%
set LastdayMon=%TodayMon%
set /A LastdayDay=TodayDay-1

echo %TodayDay%
echo %LastdayDay%

if "%LastdayDay%" == "0" (
  if "!LastdayMon!" == "01" (
  set LastdayMon=12
  set /A LastdayYear-=1
  ) else (
  set /A LastdayMon-=1
   
  if "!LastdayMon!" == "1" set LastdayMon=01
  if "!LastdayMon!" == "2" set LastdayMon=02
  if "!LastdayMon!" == "3" set LastdayMon=03
  if "!LastdayMon!" == "4" set LastdayMon=04
  if "!LastdayMon!" == "5" set LastdayMon=05
  if "!LastdayMon!" == "6" set LastdayMon=06
  if "!LastdayMon!" == "7" set LastdayMon=07
  if "!LastdayMon!" == "8" set LastdayMon=08
  if "!LastdayMon!" == "9" set LastdayMon=09
  )

  if "!LastdayMon!" == "01" set LastdayDay=31
  if "!LastdayMon!" == "03" set LastdayDay=31
  if "!LastdayMon!" == "04" set LastdayDay=30
  if "!LastdayMon!" == "05" set LastdayDay=31
  if "!LastdayMon!" == "06" set LastdayDay=30
  if "!LastdayMon!" == "07" set LastdayDay=31
  if "!LastdayMon!" == "08" set LastdayDay=31
  if "!LastdayMon!" == "09" set LastdayDay=30
  if "!LastdayMon!" == "10" set LastdayDay=31
  if "!LastdayMon!" == "11" set LastdayDay=30
  if "!LastdayMon!" == "12" set LastdayDay=31
   
  if "!LastdayMon!" == "02" (
  set IsLeapYear=
   
  set /A IsLeapYear=!LastdayYear!%%400
  if "!IsLeapYear!" == "0" (
  set LastdayDay=29
  goto MAKELASTDATE
  )
   
  set /A IsLeapYear=!LastdayYear!%%100
  if "!IsLeapYear!" == "0" (
  set LastdayDay=28
  goto MAKELASTDATE
  )
   
  set /A IsLeapYear=!LastdayYear%%4
  if "!IsLeapYear!" == "0" (
  set LastdayDay=29
  goto MAKELASTDATE
  ) else (
  set LastdayDay=28
  goto MAKELASTDATE
  )
  )
)

:MAKELASTDATE

if "%LastdayDay%" == "1" set LastdayDay=01
if "%LastdayDay%" == "2" set LastdayDay=02
if "%LastdayDay%" == "3" set LastdayDay=03
if "%LastdayDay%" == "4" set LastdayDay=04
if "%LastdayDay%" == "5" set LastdayDay=05
if "%LastdayDay%" == "6" set LastdayDay=06
if "%LastdayDay%" == "7" set LastdayDay=07
if "%LastdayDay%" == "8" set LastdayDay=08
if "%LastdayDay%" == "9" set LastdayDay=09

 

rem 该程序有bug 下面几句话进行修正8月1号和9月1号的日期

if !TodayMon!==08    if !TodayDay!==01       set LastdayMon=07
if !TodayMon!==08    if !TodayDay!==01       set LastdayDay=31

if !TodayMon!==09    if !TodayDay!==01       set LastdayMon=08
if !TodayMon!==09    if !TodayDay!==01       set LastdayDay=31

 

set LastDate=%LastdayYear%%LastdayMon%%LastdayDay%

@echo Today =%date:~0,4%%date:~5,2%%date:~8,2%
@echo Yestoday=%LastDate%
pause