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

If you are processing a time from ps, mind you that the format 2-18:01 is also possible for 2 days, 19 hours, 1 minute. In that case you'll want to checkout: Parse ps' "etime" output and convert it into seconds

Answer 2

echo "40.25" | awk -F: '{ if (NF == 1) {print $NF} else if (NF == 2) {print $1 * 60 + $2} else if (NF==3) {print $1 * 3600 + $2 * 60 + $3} }'
40.25
echo "10:40.25" | awk -F: '{ if (NF == 1) {print $NF} else if (NF == 2) {print $1 * 60 + $2} else if (NF==3) {print $1 * 3600 + $2 * 60 + $3} }'
640.25
echo "20:10:40.25" | awk -F: '{ if (NF == 1) {print $NF} else if (NF == 2) {print $1 * 60 + $2} else if (NF==3) {print $1 * 3600 + $2 * 60 + $3} }'
72640.25

Answer 3

With GNU date, you can perform the conversion if the duration is less than 24 hours, by treating it as a time of day on the epoch:

to_seconds() {
    local epoch=$(date --utc -d @0 +%F)
    date --utc -d "$epoch $1" +%s.%09N
}

Running it with the example from the question:

$ to_seconds 00:20:40.29
1240.290000000

Note that --utc, @, %s and %N are all GNU extensions not necessarily supported by other implementations.

Answer 4

You can convert minutes to hour, seconds, or minutes with bc command.

By example:

How many minutes for 1000 sec ?

$ echo 'obase=60;1000' | bc
02 00

then -> 2 min

How much hour for 375 min ?

$ echo 'obase=60;375'| bc
06 15

then -> 06h15

How days for 56 hours?

$ echo 'obase=24;56' | bc
02 08

then 02 days and 08 hours

bc with obase is extra!

Answer 5

with the shell,

#!/bin/bash

d="00:20:40.28"
IFS=":"
set -- $d
hr=$(($1*3600))
min=$(($2*60))
sec=${3%.*}
echo "total secs: $((hr+min+sec))"

Answer 6

TZ=utc date +'%s' -d "1970-01-01 00:00:38"