@echo off & setlocal enabledelayedexpansion
set "fileA=a.txt"
set "fileB=b.txt"
for %%i in ("%fileA%" "%fileB%") do (
set /a num+=1
set "data!num!=%%~ti"
)
if "%data1%" gtr "%data2%" (copy /y "!fileA!" "!fileB!") else (echo 不替换)
pause
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