How to change the format of the date column in a flat file?

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# 1  
Old 11-28-2013
How to change the format of the date column in a flat file?


i have a flat file namely temp.txt with this data below

I need to modify the date data in the flat file into MM/DD/YYYY HH24:MI:SS format

let me know the code for this.

Thank you!

Last edited by Franklin52; 11-28-2013 at 04:31 AM.. Reason: Please use code tags
# 2  
Old 11-28-2013
With some assumptions,

Try this,

We have to do error handling in below code Smilie

while IFS="|" read a c b
[[ p=$(date -d "$b" +"%m/%d/%Y %r") ]] && print $a"|"$c"|"$p || print $a"|"$c"|"$b

Last edited by pamu; 11-28-2013 at 05:59 AM..
# 3  
Old 11-28-2013
In gnu sed and date:
sed -r 's/(([^\|]*\|){2})([0-9]{4}(-[0-9]{2}){2})/date -d "\3" +"\1%m\/%d\/%Y %r"/e' file

# 4  
Old 11-28-2013
One more might be bad approach calling date inside awk and even lengthy...

$ cat file

awk '

function cmd(cmde,result){ 
                              while ((cmde | getline line) > 0)
                                      result = result (result=="" ? "" : "\n")line
                              return result

                          $3 = cmd("date" " " "-d""\""$3"\"" " " "+%m/%d/%Y\\ %r")
    ' FS="|" OFS="|"  file

101|Kay|12/26/2013 12:00:00 AM IST
102|let|12/26/2013 12:00:00 AM IST

# 5  
Old 11-28-2013
Not sure where to take the time from, so -
awk 'NR==1 {print;next} {split ($3, T, "-"); $3=sprintf("%s/%s/%s 00:00:00:00", T[2], T[3], T[1])}1' FS="|" OFS="|" file
101|Kay|12/26/2013 00:00:00:00
102|let|12/26/2013 00:00:00:00

# 6  
Old 11-28-2013
Yes no need to use date to reformat this one it's just a simple string manipulation, this is simplar to RudiCs:

awk -F\| 'NR>1{split($3,T,"-");$3=T[2]"/"T[3]"/"T[1]" 00:00:00"}1' OFS=\| infile

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