Classic delayed expansion issue.
Your problem is that
%time% expansion occurs when the statement is parsed, and the entire parenthesized block is parsed at the same time, before any commands are executed.
There are three possible solutions:
TIME /T instead
This avoids the whole issue of expansion timing. But the format is different, and there is a newline after the time, so you can't add a label to the end.
echo Backing up first part
If you want the label on the same line, then you could reverse the order and use SET /P
<nul set /p "Backing up first part - "
Or you can capture the output with a FOR /F loop and put everything on one line
for /f "delims=" %%T in ('time /t') do echo %%T - Backing up first part:
2) Use CALL and doubled percents to get an extra round of parsing
call echo %%time%% - Backing up first part:
See How does the Windows Command Interpreter (CMD.EXE) parse scripts? for an understanding of why this works. Phases 1 and 6 are relevant here. But be forewarned - it is a lot of very dense material that will take time to digest.
3) Use delayed expansion
This is the technique that I prefer to use.
This is much faster than the CALL hack. It requires SETLOCAL to enable delayed expansion, and use of
! instead of
% to expand the variable:
> C:\log\%date:~3,2%-%date:~0,2%.log (
echo !time! - Backing up first part
... some logic
echo !time! - Backing up second part