formatted timestamp correctly

bashbot-lib.sh

@@ -114,7 +114,7 @@ getcbk_data() {
 gettimestamp() {
   local timestamp="$(tail -n 1 "${bot_tmpdir}${1}"\
    | grep "\"date\"" | grep -om1 "\"date\":[0-9]\+,")"
-   [ ! -z "${timestamp}" ] && printf "%s" "${timestamp:7:-1}"
+   [ ! -z "${timestamp}" ] && date "+%D %H:%M" -d "@${timestamp:7:-1}"
 }
 
 # $1 is name of a bash array with the number of columns in every row such as ( 1 1 3 ) for a 3 row keyboard in which the first and second row have 1 column, and the third has 3