format of zip command - producing 2 results..

Script1:
set Date=%Date:~-4%_%DATE:~4,2%_%DATE:~7,2%
"C:\Program Files\7-Zip\7z.exe" a -tzip E:\BACKUP\DOSPNSLiveDeploy\DOSPNSLiveDeploy_%Date% E:\Backup\DOSPNSLiveDeploy\DOSPNSLiveDeploy_backup_*.bak
~~~
Script2:
set Date=%Date:~-4%_%DATE:~4,2%_%DATE:~7,2%
"C:\Program Files\7-Zip\7z.exe" a -tzip E:\BACKUP\bnscapp\bnscapp_%Date% E:\Backup\bnscapp\bnscapp_backup_*.bak

The zip files produced by script2 are good and 'normal', ie I can double click on the zipped file and it opens up..
but with the file produced by scipt1, if I double click the zipped file, it tells me
"The compressed (zipped) Folder is invalid or corrupted."

the syntax is the same.. any thoughts?
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Bill PrewCommented:
Run the first script from a command window, and see what error or warning messages it displays when doing the ZIP.  The syntax looks okay as you have it, but perhaps it can't find any files, or is getting an access error, or a folder doesn't exist, etc.  7ZIP should give you feedback at the command prompt when you run it.

~bp
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