Problem Converting 12-Hr To 24-Hr

I’m trying to determine if files written to a buffer directory are less than 5KB. My problem lies in that FORFILES outputs time in 12-hr format while echo’ing %time% outputs in 24-hr.

This snippet is where I think I’m running into an issue. (I’m getting the Missing Operand error, and I can’t see where I’m going wrong… maybe I just need another set of eyes.)
[code]if NOT %%a==12 (
if %%d==PM (set /a hh=%%a+12) else (set /a hh=%%a)
) else (set /a hh=%%a)[/code]

This is the entire script.
[code]
REM Calls directory = %1
REM File size (bytes) = %2
REM Time check window (min) = %3

forfiles /p %1 /m *.wav /s /d -0 /c “cmd /c echo @fsize @ftime @fname” >> FSizes

echo ; > Problems

REM FORFILES adds an empty line at beginning of file. Remove it.
more +1 FSizes > FSizes2

for /f “tokens=1,2,3,4” %%i in (FSizes2) do (
REM Testing %%l

echo %%j:%%k> FileTimeRaw
for /f “tokens=1,2,3,4 delims=:” %%a in (FileTimeRaw) do (
if NOT %%a==12 (
if %%d==PM (set /a hh=%%a+12) else (set /a hh=%%a)
) else (set /a hh=%%a)
)
set /a mm=%%b
set filetime=%hh%%mm%
)

set /a timediff=%time:~0,2%%time:~3,2%-%filetime%

REM File is too old
if NOT %timediff% GTR %3 (

REM File is too big
if NOT %%i GTR %2 (

REM File is from yesterday
if NOT %timediff% LSS 0 (

echo SMALLFILE >> Problems
)
)
)
)

set x=0

for /f “eol=;” %%i in (Problems) do set /a x=%x%+1

echo %x%

:end
[/code]