Grabbing System Date in a Batch File
Batch programming can be a powerful thing. Basically, anything you can run at a command prompt can be run in a batch file. Coupled with task scheduler, process automation nirvana can be achieved.
However, one thing that is conspicuously is the presence of a date or time variable. For example, if you wanted to date or time encode a filename or create a log entry, you have no way to do that in native batch. But there is a way!
There is a DATE command is available though. With a simple bit of trickery, we can grab that info and store it in a variable, then use it however we want within our script.
The actual code is posted at the bottom of this article, but I want to give a basic flow/explanation of what is going on with it first. Because knowledge is power, that's why. And not everyone is a seasoned IT professional.
- First, we need to decide if the DATE command is available. Some administrators may limit this command for users. Not sure why, but it happens.
- First we echo the date and look for the string mm.
- If the string doesn't exist, the command must not be available, so exit the script.
- Otherwise, continue to grab the date info.
- Assuming the date is available, we'll run the DATE /T command. and step through it to find certain delimiters, namely the slash (/)
- For each delimiter we find the necessary value of the year, month or day, and store it in a variable (YYYY, MM, or DD)
- After all pieces are found, they are combined into a single variable, DateStamp
Pretty straightfoward, eh? At the bottom of the code, there is a small section on how to use the variable in some file operations, such as creating a directory or copying a file.
Anyway, here is the code, watch out for line wrap. Hope this helps!
echo *** Finding DateStamp YYYYMMDD
REM *** Echo date to null. If the date command is not available, exit the script
echo. | date | FIND "(mm" > NUL
If errorlevel 1,(call :Parsedate DD MM) Else,(call :Parsedate MM DD)
REM *** The date is available. Parse the output of DATE /T
For /F "tokens=1-4 delims=/.- " %%A in ('date /T') do if %%D!==! (set %1=%%A&set %2=%%B&set YYYY=%%C) else (set DOW=%%A&set %1=%%B&set %2=%%C&set YYYY=%%D)
REM *** Example usage of DateStamp variable
echo *** Datestamp:%DateStamp%
REM *** Sample usage of the variable
REM *** first, create a directory with the datestamp pre-pended to the directory name
REM *** copy a file with the date in the filename
copy c:\myfile.txt k:\backup\%DateStamp%_myfile.txt
About the Author
dwirch has posted a total of 172 articles.
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