"Event Type : Full Histogram"
"Serial Number : xxxxxx"
"Version :  V 10.60-8.17 "
"File Name : W133FA0Z.580H"
"Histogram Start Time : 12:39:08"
"Histogram Start Date : 2014-04-11"

StartDate StartTime

2014-04-11 12:39:08

@echo off
pushd "pathToYourFolderContainingFilesToRename"
for /f "tokens=1,3 delims=:" %%A in (
  'findstr /bc:^""Histogram Start Date :" *.txt'
) do for /f delims^=^"^  %%C in (
  "%%B"
) do for /f tokens^=4-6^ delims^=^":^  %%D in (
  'findstr /bc:^""Histogram Start Time :" "%%A"'
) do ren "%%A" "%%C %%D.%%E.%%F.txt"
popd

@echo off&cls

setlocal EnableDelayedExpansion

for %%x in (*.txt) do (
set /a $sw=1
for /f "skip=4 tokens=2-4 delims=:" %%a in ('type "%%x"') do (
if !$sw! equ 1 set $Time=%%a-%%b-%%c
if !$sw! equ 2 (
set $Date=%%a
call:DoRen !$Time:~1,-1! !$Date:~1,-1! %%~nx%%~xx)
set /a $sw+=1
)
)
exit/b

:DoRen

echo ren "%3" "%2 %1"

@echo off

set file=test.txt

for /f "delims=: tokens=2-4" %%a in ('find "Time" %file%') do set ftime=%%a%%b%%c
for /f "delims=: tokens=2"   %%a in ('find "Date" %file%') do set fdate=%%a

echo %fdate:~1,-1% %ftime:~1,-1%

@echo off
setLocal enableDelayedExpansion
for /f %%f in ('dir C:whateverpath*.txt /B') do (
    for /f "delims=: tokens=2-4" %%a in ('find "Time" %%a') do set ftime=%%a%%b%%c
    for /f "delims=: tokens=2"   %%a in ('find "Date" %%a') do set fdate=%%a
    ren "%%~a" "!fdate:~1,-1! !ftime:~1,-1!.txt"
)