7-Zip CMD: Add current date to archive and include only the last modified folder in archive

I'm trying to create a backup script with 7-Zip. I have everything else done already, but these two issues are still blocking me.

Firstly, I want to add a timestamp with a create date like this: 3.11.2010 Backup.7z

So the dd.mm.yyyy format. I tried several versions I found on the Internnet, but none of these would work the way I wanted. What should I do?

Secondly, I only want to add the last modified folder to the archive (no matter how many folders exist in directory; I just need the latest). Basically, I have something like this:

App_v.1.0.0.4.exe_Url_2um2yok5q4vpoxnvnscpq3adfwff4wsmi
App_v.1.0.0.5.exe_Url_ft4mnvbu54hfrgdhxrahj4imlmermdsoe

So I want to add the newest (1.0.0.5) folder only. These folders change and always have different names so name based sorting would be a bad idea.

Solution 1:

7z a -r "%DATE:~7,2%.%DATE:~4,2%.%DATE:~-4% Backup".7z

Will create the archive with DD.MM.YYYY Backup.7z Format.

Explanation: Echoing %DATE% prints the date in your regional date format setting.

D:\>echo %DATE%
Thu 11/04/2010

By using ~x,y specifier your are doing an in string/substring extraction of the string - where x is the starting character and y number of characters you wish to extract.

On your second point:

I only want to add last modified folder to archive(no matter how many folders exist in directory I just need the latest).

7z u -r "%DATE:~2,2%.%DATE:~5,2%.%DATE:~-4% Backup".7z 

should do it.

Solution 2:

You can use "windows management instrumentation". See this one

test1.bat:

set mydate=
for /f "skip=1" %%x in ('wmic os get localdatetime') do if not defined mydate set mydate=%%x
echo Current date is %mydate%

Result:

Current date is 20140202145547.557000+060

Regardless of your "regional settings" (date format) in "Control Panel" it always returns YYYYMMDD.