[数值计算] 获取系统时间的代码在CMD中可行，在批处理文件中为何取不到值？

@echo off
call start cmd /k "path=%path%;%~d0\DOS\网络;%~d0\DOS\command\第三方命令行程序;%~d0\DOS\command;%~d0\DOS\源码;%~d0\DOS\sysbkup"
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::set "sourFile=源文件" set "destFile=目标文件"  行列:row 总数sum 默认default  pushd/popd echo %errorlevel%
::前缀Prefix 后缀Suffix
::if defined set "destFolder=目标文件夹" 计数Count %ERRORLEVEL%
::for /f "delims=\" %%i in ('if "%isXP%"^=^="1" ^(fsutil fsinfo drives^|find /v ""^) else ^(for /f %%m in ^('fsutil fsinfo drives^^^|find /v ""'^) do echo %%m^)') do (
::for /f "eol= skip= tokens=* delims= " %%a in ('') do (
::for /f "delims=" %%i in ("!ee!") do echo %%~nxi>>hf_1.txt
::for /f "skip= tokens=1,2,3* usebackq delims=" %%a in ("音频 说明.txt") do echo %%a
::set "cmdstr=dir /ad /b "%APPDATA%"^|findstr /lixv "Microsoft SogouPY SogouPY.users""
::for /f "delims=" %%a in ('%cmdstr%') do echo rd /s /q "%APPDATA%\%%a"
::echo ①②③④⑤⑥⑦⑧⑨⑩
@echo off
::setlocal enabledelayedexpansion&cls
path=%path%;%~d0\DOS\网络;%~d0\DOS\command\第三方命令行程序;%~d0\DOS\command;%~d0\DOS\源码;%~d0\DOS\sysbkup
:start ============================================================
set t1="%time:~0,2%"
set t2="%time:~3,2%"
echo %t1% --- %t2%

:end =============================================================
endlocal&setlocal disabledelayedexpansion&echo 按任意键退出&pause>nul
::(mode con cols=80 lines=25&color 07&CHCP 437&graftabl 936)>nul
for /f "tokens=2" %%a in ('CHCP') do (if not "%%a"=="437" (color 07&CHCP 437&graftabl 936))>nul
del sed??????
cls&exit/b
echo 退出...&ping/n 4 127.1>nul
for /l %%a in (5,-1,0) do (set/p =退出... ^(%%a^)<nul&ping/n 2 127.1>nul)
::=======================MODE CODE==============================

::=======================END MODE===============================
set "char=abcdefghijklmnopqrstvuwxyz"
set "char=ABCDEFGHIJKLMNOPQRSTUVWXYZ"
%%a %%b %%c %%d %%e %%f %%g %%h %%i %%j %%k %%l %%m %%n %%o %%p 
@echo.===== Ver: 1.0 =========================== 发布日期: 2010-08-10 =======
@echo.	BAT_NAME:	findDupFile.bat
@echo.	返回值:		%ret_filename%
@echo.	作用  :		根据MD5值查找重复文件
@echo.	调用:	findDupFile.bat Path [EXT]
@echo.		Path :	文件夹路径
@echo.		[EXT] :	文件后缀 如:"*.jpg *.bmp",带空格的必须用引号括起来
@echo.====================== Copyright@ by hf-g 2010-08-10 [彭城] ============
set "choice="&set/p choice=输入你的选择(1/2/q):
if /i "%choice%"=="q" goto end
echo %choice%|findstr "^[123]$">nul 2>nul&&goto choice%choice%
goto end
echo\相当于输入一个回车  退格符
set/p =-<nul>con&set/p =\<nul>con&set/p =^|<nul>con&set/p =/<nul>con
%* 从第一个参数开始的所有参数
call echo %%text!a!%%
taskkill  /f /im regedit.exe 2>nul
::━━━━━━━━━━━━━━━━ ━━━━━━━━━━━━━━━━━━━━
::————*————*————*————*————*————*————*————
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echo %time:~0,2% --- %time:~3,2%
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@echo off
> b.bat (
  echo set t=%%time:~0,2%%
  echo set t2=%%time:~3,2%%
  echo echo %%t%% --- %%t2%%
)
call b.bat
pause
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