How to tag Git code

#! /bin/bash

tag_me()
{
tag_name=$1
message=$2
TIME=`date +%Y-%m-%d-%H-%M`
git tag -d $tag_name
git tag -a -f -m "$message" $tag_name-$TIME
git push origin tag $tag_name-$TIME
}


if [ $# -ne 2 ] ;then
echo 1>&2 Usage: $0 tag_name message
exit 127
fi

tag_me $1 $2



usage :

./tag_scripts tag_name messages