Windows backup script - Better way to determine current day?

I've got this backup script I use to back up using ntbackup to our NAS and have it automatically cull old files.  The backups are growing and I needed to eliminate the number of normal backups by one and increase retention to 2 weeks (normal backup every other week).  I changed the backup script to go for 2 full weeks, but out of the blue, it created empty folders for 11-Wednesday and 13-Friday (on the 11th and the 13th, in fact).  I think it's related to how the batch file is determining the day of the week.

Is there a better way to do this?

:HOME
net use G: /delete /y
net use \\YoyosRUsbackup\backup /delete /y
IF NOT EXIST G:\ net use G: \\YoyosRUsbackup\backup /user:admin YoyosRUsPassword
g:
cd\
IF NOT EXIST Weekly CALL d:\cycle.bat
cd Weekly
IF NOT EXIST 0 CALL d:\cycle.bat
cd 0

IF NOT EXIST 01-Sunday GOTO SUNDAY

:DATES
for /f %%a in ('date /t') do set DAY=%%a
IF %DAY%==Sun EXIT
IF %DAY%==Mon GOTO MONDAY
IF %DAY%==Tue GOTO TUESDAY
IF %DAY%==Wed GOTO WEDNESDAY
IF %DAY%==Thu GOTO THURSDAY
IF %DAY%==Fri GOTO FRIDAY
IF %DAY%==Sat GOTO SUNDAY

:SUNDAY
IF EXIST 01-Sunday GOTO SATURDAY
md 01-Sunday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\Full.bks" /n "Backup created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m normal /j "Full" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\01-Sunday\YoyosRUsfull.bkf"
exit

:MONDAY
IF EXIST 02-Monday GOTO MONDAY2
md 02-Monday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\02-Monday\YoyosRUsinc.bkf"
exit

:TUESDAY
IF EXIST 03-Tuesday GOTO TUESDAY2
md 03-Tuesday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\03-Tuesday\YoyosRUsinc.bkf"
exit

:WEDNESDAY
IF EXIST 04-Wednesday GOTO WEDNESDAY2
md 04-Wednesday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\04-Wednesday\YoyosRUsinc.bkf"
exit

:THURSDAY
IF EXIST 05-Thursday GOTO THURSDAY2
md 05-Thursday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\05-Thursday\YoyosRUsinc.bkf"
exit

:FRIDAY
IF EXIST 06-Friday GOTO FRIDAY2
md 06-Friday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\06-Friday\YoyosRUsinc.bkf"
exit

:SATURDAY
IF EXIST 07-Saturday GOTO SUNDAY2
md 07-Saturday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\02-Monday\YoyosRUsinc.bkf"
exit

:SUNDAY2
IF EXIST 08-Sunday GOTO SATBREAK
md 08-Sunday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\03-Tuesday\YoyosRUsinc.bkf"
exit

:MONDAY2
IF EXIST 09-Monday GOTO SATBREAK
md 09-Monday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\04-Wednesday\YoyosRUsinc.bkf"
exit

:TUESDAY2
IF EXIST 10-Tuesday GOTO SATBREAK
md 10-Tuesday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\05-Thursday\YoyosRUsinc.bkf"
exit

:WEDNESDAY2
IF EXIST 11-Wednesday GOTO SATBREAK
md 11-Wednesday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\06-Friday\YoyosRUsinc.bkf"
exit

:THURSDAY2
IF EXIST 12-Thursday GOTO SATBREAK
md 12-Thursday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\05-Thursday\YoyosRUsinc.bkf"
exit

:FRIDAY2
IF EXIST 13-Friday GOTO SATBREAK
md 13-Friday
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\ChiqutaBanana\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\YoyosRUsDiff.bks" /n "YoyosRUsinc.bkf created %DATE% at %TIME%" /d "Set created 7/20/2010" /v:no /r:yes /rs:no /hc:off /m incremental /j "YoyosRUsInc" /l:s /f "\\YoyosRUsbackup\backup\Weekly\0\06-Friday\YoyosRUsinc.bkf"
exit

:SATBREAK
CALL d:\cycle.bat
GOTO HOME

This script runs every day at 6:00PM.  It also runs Saturday at 3AM (so it can run it's full backup, which would go into the 01-Sunday folder).  The full backup usually takes around 60 hours to run (hence why I want it to start right after the differential backup should be finished).

Any hints on how to run this better?  Am I getting the days wrong?  Is there a VB version that works better?  Thanks.