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Calculating the epoch time from standard time using awk and calculating the duration

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# 1  
Old 05-23-2012
Calculating the epoch time from standard time using awk and calculating the duration

Hi All,

I have the following time stamp data in 2 columns
     Date    TimeStamp(also with milliseconds)
05/23/2012 08:30:11.250
05/23/2012 08:30:15.500
05/23/2012 08:31.15.500


From this data I need the following output.

0.00( row1-row1 in seconds)
04.25( row2-row1 in seconds)
64.25(row3-row1 in seconds)

I tried to convert the second column into seconds using HH*60*60+MM*60+SS+MS(milliseconds) formula and subtracting line by line but the problem is if the date changes at some row, I don't know how to proceed.
May be converting ecah column into epoch time and adding together and subtracting row wise can work,
but i don't know how to do that.

Any help in this regard is highly helpful for me.
# 2  
Old 05-23-2012
[root@host dir]# cat input
Date TimeStamp
05/23/2012 08:30:11.250
05/23/2012 08:30:15.500
05/23/2012 08:31:15.500
[root@host dir]# cat
#! /bin/bash

while IFS=. read x y
    if [ $line -eq 1 ]
        (( line++ ))
    elif [ $line -eq 2 ]
        refTime=$((($(date -d "$x" +%s) * 1000) + $y))
        echo "0.000"
        (( line++ ))
        time=$((($(date -d "$x" +%s) * 1000) + $y))
        echo "scale=3; ($time - $refTime) / 1000" | bc -l
        (( line++ ))
done < input
[root@host dir]# ./
[root@host dir]#

Of course, you need GNU date and the bench calculator.
# 3  
Old 05-23-2012
ksh93 version u or newer:
  while IFS=. read dd ms
    stamp="$(printf "%(%s)T" "$dd").$ms"
    if [ -z $ref ]; then
    printf "%0.2f\n" $(( stamp - ref ))
} < infile

There is a typo on the last line of the sample... (05/23/2012 08:31:15.500)
# 4  
Old 05-23-2012
$echo "05/23/2012 08:30:11.250
05/23/2012 08:30:15.500
05/23/2012 08:31:15.500" | 
awk -v FS="[/:. ]+" '{MICRO=(mktime($3" "$1" "$2" "$4" "$5" "$6)*1000)+$7; 
if (NR==1)
    {printf "%.2f\n", (MICRO-FIRST)/1000} }'

This User Gave Thanks to ni2 For This Post:
# 5  
Old 05-25-2012

Thanks Ni2 and Balajesuri,

Your scripts worked well with little output formatting issues.

Just FYI, I came up with the below command written myself.

awk '{sub("/"," ",$1);print}' input |awk '{sub("/"," ",$2);print}' | sed -e's/:/ /g' | awk '{printf "%.3f\n", $1*2629743 + $2*86400 + ($3-1970)*31556926 +$4*3600 +$5*60+$6}' |awk 'FNR==1 {p=$1} {print $1-p}'

I simply converted the date and time into epoch time and calculated the elapsed time.

Which worked really well and fulfilled my requirements.

# 6  
Old 05-25-2012
Although this latter approach is not a conversion but an approximation and it will show (big) conversion errors around date changes..

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