BatCoder

@echo off
rem 调用GNU for Win32的date.exe
set "gnuDate=C:\test\date.exe"
for /f %%a in ('%gnuDate% "+%%Y%%m01"') do (
    for /f %%h in ('%gnuDate% -d "%%a 1 days ago" "+%%Y-%%m-%%d"') do (
        set "lastEndDay=%%h"
    )
)
echo,%lastEndDay%
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BatCoder

@echo off
>"%temp%\DstDate.vbs" echo strLastDate=DateAdd("d", -DatePart("d", Date), Date)
>>"%temp%\DstDate.vbs" echo strFmtDate=Right(Year(strLastDate),4) ^& Right("0" ^& Month(strLastDate),2) ^& Right("0" ^& Day(strLastDate),2)
>>"%temp%\DstDate.vbs" echo WScript.Echo strFmtDate
for /f %%a in ('cscript /nologo "%temp%\DstDate.vbs"') do (
    set "lastEndDay=%%a"
)
set lastEndDay=%lastEndDay:~0,4%-%lastEndDay:~4,2%-%lastEndDay:~6,2%
echo,%lastEndDay%
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BatCoder

@echo off
rem 调用Bill Stewart的DateX.exe
set "xDate=C:\test\DateX.exe"
rem 假设系统日期格式是yyyy-mm-dd
set day=%date:~8,2%
for /f %%a in ('"%xDate%" -o -%day%') do (
    set "lastEndDay=%%a"
)
echo,%lastEndDay%
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