[Foreigner]

Mikhail_R,
Без секунд:

Код:

for %%i in ("d:\backup\entity.xml") do call:1 "%%~ti" 
goto:eof 

:1
set "datetime=%~1"
set "datetime=%datetime::=-%"

ren "%outdir%\entity.xml" "entity_sanctions_%datetime: =_%.xml"