How to create a datetime stamp within a batch script in the format YYYY-MM-DD

Below is a batch script that populates the variable Timestamp with a datetime value in the format YYYY-MM-DD_HH:MM:SS.

This technique can then be used when creating files etc.

To try out the example below copy the text and paste it into a text editor like notepad. Save the file as timestamp with the extension .bat and then double click on the filestamp.bat file.

This code example will display the current datetime in windows command shell. It will also create a blank file called Test along with the current datetime in the format yyyymmddhhmmss in the same directory the batch script is run from.

@ECHO off
CLS
ECHO Date format = %date%
ECHO dd = %date:~0,2%
ECHO mm = %date:~3,2%
ECHO yyyy = %date:~6,8%
ECHO.
ECHO Time format = %time%
ECHO hh = %time:~0,2%
ECHO mm = %time:~3,2%
ECHO ss = %time:~6,2%
ECHO.
SET Timestamp=%date:~6,8%-%date:~3,2%-%date:~0,2%_%time:~0,2%:%time:~3,2%:%time:~6,2%
ECHO %Timestamp%
SET Timestamp=%date:~6,8%%date:~3,2%%date:~0,2%%time:~0,2%%time:~3,2%%time:~6,2%
ECHO %Timestamp%
BREAK>Test%Timestamp%.txt 
PAUSE
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