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nawk -F, '{n=split($3,a,":"); s+=(a[1]*3600+a[2]*60+a[3])}END{printf("%02d:%02d:%02d\n", s/3600,s%3600/60,s%3600%60)}' myFile

$ echo 14322 |awk '{$0=sprintf ("%06d",$0);print $1$2,$3$4,$5$6}' FS= OFS=:
01:43:22

$ echo 22 |awk '{$0=sprintf ("%06d",$0);print $1$2,$3$4,$5$6}' FS= OFS=:
00:00:22

sed 's/^/00000/;s/.*\(..\)\(..\)\(..\)$/\1:\2:\3/'

Get idea from Scrutinizer's
printf %06d 123 |sed 's/\(..\)\(..\)\(..\)$/\1:\2:\3/'

Hi,

Can you use 'perl'? Test this script. The last number is your input parameter (14322 in my example).

$ perl -Minteger -e '$a=$ARGV[0]; while ($a > 100) { push @time, $a % 100; $a /= 100; };...

The "source" command is a "bash" command. Most other shells don't support it.
The dot-space-scriptname method works with most Bourne-type shells.