中国DOS联盟

@echo off
FOR /F "TOKENS=1-3 DELIMS=- " %%A IN ('echo %DATE%') do (set Year=%%A&SET Month=%%B&SET Day=%%C)
FOR %%A IN (%Year%)  DO SET Year=%%A
FOR %%A IN (%Month%) DO SET Month=%%A
FOR %%A IN (%Day%)   DO SET Day=%%A
SET SortDate=%Year%%Month%%Day%

FOR %%A IN (%Date%) DO SET Today=%%A
SET DayS=%Day%

IF %DayS% EQU 1 (
 SET YesterY=%Year%
 CALL :RollMonth
) ELSE (
 SET /A YesterD=%DayS%-1
 SET YesterM=%Month%
 SET YesterY=%Year%
)

IF %YesterD% LSS 10 SET YesterD=0%YesterD%
SET SortYest=%YesterY%%YesterM%%YesterD%

REM CALL ECHO %SortYest%
ENDLOCAL
GOTO:EOF
:RollMonth
IF %Month%==01 (
 SET YesterD=31
 SET YesterM=12
 SET /A YesterY = %Year% - 1
)
IF %Month%==02 (
 SET YesterD=31
 SET YesterM=01
)
IF %Month%==03 (
 SET YesterD=28
 SET YesterM=02
 CALL :LeapYear
)
IF %Month%==04 (
 SET YesterD=31
 SET YesterM=03
)
IF %Month%==05 (
 SET YesterD=30
 SET YesterM=04
)
IF %Month%==06 (
 SET YesterD=31
 SET YesterM=05
)
IF %Month%==07 (
 SET YesterD=30
 SET YesterM=06
)
IF %Month%==08 (
 SET YesterD=31
 SET YesterM=07
)
IF %Month%==09 (
 SET YesterD=31
 SET YesterM=08
)
IF %Month%==10 (
 SET YesterD=30
 SET YesterM=09
)
IF %Month%==11 (
 SET YesterD=31
 SET YesterM=10
)
IF %Month%==12 (
 SET YesterD=30
 SET YesterM=11
)
GOTO:EOF

:LeapYear
SET /A mod400 = %Year% %% 400
SET /A mod100 = %Year% %% 100
SET /A mod4   = %Year% %% 4
IF %mod400% EQU 0 (
 SET YesterD=29
) ELSE (
 IF %mod100% EQU 0 (
  SET YesterD=28
 ) ELSE (
  IF %mod4% EQU 0 (
   SET YesterD=29
  ) ELSE (
   SET YesterD=28
  )
 )
)
GOTO:EOF
:Syntax
ECHO PREV: Get yesterday