Here is the shell script that will help you. You can choose different date. I used current date. Save the shell script as myrename.sh and call it ./myrename.sh dirname. Where dirname is the name of directory in which files will be affected.
#!/bin/bash
for i in `ls $1 | grep -E '[0-9]{4}-[0-9]{2}-[0-9]{2}'`
do
x=`echo $i | grep -oE '[0-9]{4}-[0-9]{2}-[0-9]{2}'`
y=`echo $i | sed "s/$x/$(date +%F)/g"`
mv $1/$i $1/$y 2>/dev/null #incase if old date is same as current date
done
Sagar
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