Convert a time span in seconds to formatted time in shell

Question

I have a variable of $i which is seconds in a shell script, and I am trying to convert it to 24 HOUR HH:MM:SS. Is this possible in shell?

Answer 1

Another approach: arithmetic

i=6789
((sec=i%60, i/=60, min=i%60, hrs=i/60))
timestamp=$(printf "%d:%02d:%02d" $hrs $min $sec)
echo $timestamp

produces 1:53:09