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Why store it? (but it's preferable to store the date string to avoid calls to date in the iteration.
#!/bin/bash
D=$(date +%d-%m-%Y)
for F in *.*
do
mv $F ${F%.*}-$D.${F##*.}"
done

Store the file's extension in a variable before mv command and substitute in the variable later while using mv command.

#!/bin/bash

thetime=`date +%Y-%m-%d--%H:%M:%S` #
for i in *.*
do ...