Concatenate test with formatted output of DATE in Bash Script

I want to append a text string and the date together to the end of text file (a log actually).

I can output the date itself with

date +'%Y-%m-%d %H:%M:%S'

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, no problem

I can append text to the file with

echo "Manual Restart Completed at " >> log/myservice.log

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again, no problem.

But when I try something to put them together like:

echo "Manual Restart Completed at " DATE +'%Y-%m-%d %H:%M:%S' >> /var/log/myservice.log

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it fails and I've googled for an hour and can't find the solution.