Simple way to convert HH:MM:SS (hours:minutes:seconds.split seconds) to seconds

Question

What\'s an easy way to convert 00:20:40.28 (HH:MM:SS) to seconds with a Bash script?

Split seconds can be cut out, it’s not essential.

Answer 1

Try awk. As a bonus, you can keep the split seconds.

echo "00:20:40.25" | awk -F: '{ print ($1 * 3600) + ($2 * 60) + $3 }'

Answer 2

I haven't tested this but, I think this is how you'd split the string. Followed by multiplying by the appropriate amounts for hours and minutes.

mytime=’00:20:40.28′
part1=${mytime%%:*}; rest=${mytime#*:}
part2=${rest%%:*}; rest=${rest#*:}
part3=${rest%%:*};

Answer 3

I have this old shell function (/bin/sh compatible in the sense of POSIX shell, not bash) which does this conversion in integer math (no fractions in the seconds):

tim2sec() {
    mult=1
    arg="$1"
    res=0
    while [ ${#arg} -gt 0 ]; do
        prev="${arg%:*}"
        if [ "$prev" = "$arg" ]; then
            curr="${arg#0}"  # avoid interpreting as octal
            prev=""
        else
            curr="${arg##*:}"
            curr="${curr#0}"  # avoid interpreting as octal
        fi
        curr="${curr%%.*}"  # remove any fractional parts
        res=$((res+curr*mult))
        mult=$((mult*60))
        arg="$prev"
    done
    echo "$res"
}

Outputs:

$ tim2sec 1:23:45.243
5025

It works with SS, MM:SS and HH:MM:SS only :)

Answer 4

This would work even if you don't specify hours or minutes: echo "04:20:40" | sed -E 's/(.*):(.+):(.+)/\1*3600+\2*60+\3/;s/(.+):(.+)/\1*60+\2/' | bc

Answer 5

If you don't know what exactly do you have - SS, MM:SS or HH:MM:SS, like after youtube-dl --get-duration, then awk magic could be useful:

echo 12 | awk -F\: '{ for(k=NF;k>0;k--) sum+=($k*(60^(NF-k))); print sum }'
12
echo 35:12 | awk -F\: '{ for(k=NF;k>0;k--) sum+=($k*(60^(NF-k))); print sum }'
2112
echo 1:35:12 | awk -F\: '{ for(k=NF;k>0;k--) sum+=($k*(60^(NF-k))); print sum }'
5712

Answer 6

Try this:

T='00:20:40.28'
SavedIFS="$IFS"
IFS=":."
Time=($T)
Seconds=$((${Time[0]}*3600 + ${Time[1]}*60 + ${Time[2]})).${Time[3]}
IFS="$SavedIFS"

echo $Seconds

($<string>) splits <string> based on the splitter (IFS).

${<array>[<index>]} returns the element of the <array> at the <index>.

$((<arithmetic expression>)) performs the arithmetic expression.

Hope this helps.