Generate time sequence in bash

generate-time-sequence.sh

for i in $(seq -w 1 02); 
do
    for j in $(seq -w 10); 
    do  
        for k in $(seq -w 16);
        do
            printf '%s:%s:%s,\t' "$i" "$j" "$k";
        done
    done
done
echo ""
echo "========================"
echo ""
for m in {1..2}; 
do
    for n in {0..10}; 
    do  
        for t in {0..16};
        do
            printf '%02d:%02d:%02d,\t' $m $n $t; 
        done
    done
done
echo ""
echo "========================"
echo ""

starttime=$(date -d "2023-07-20 01:05:33" +'%s')
endtime=$(date -d "2023-07-20 06:39:20" +'%s')
while [ "$starttime" -le "$endtime" ]
do
    res=$(date -d @$starttime +'%H:%M:%S')
    resfull=$(date -d @$starttime +'%Y-%m-%d %H:%M:%S')
    printf "%s, %s\t" "$res" "$resfull"
    starttime=$(($starttime+600))
done
echo ""

https://stackoverflow.com/questions/36394854/how-to-generate-sequential-dates-times-in-a-shell-script

https://unix.stackexchange.com/questions/60257/how-to-create-a-sequence-with-leading-zeroes-using-brace-expansion

https://unix.stackexchange.com/questions/335013/how-do-i-get-0-padded-numbers-in-brace-expansion