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Time difference

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# 1  
Old 06-17-2010
Time difference
Hi,

I have a tab delimited file with GMT time. How to convert the GMT to PST time and store the line only if date falls to 2 days ago date.
Say today is 16, date should be of 14. or else remove the line
Code:
abc  -       -       [13/Jun/2010:06:30:04    +0000]
efg  -       -       [14/Jun/2010:23:30:35    +0000]
hij  -       -       [15/Jun/2010:08:00:56    +0000]
kln  -       -       [15/Jun/2010:01:00:34    +0000]
abc  -       -       [16/Jun/2010:06:30:04    +0000]
efg  -       -       [17/Jun/2010:23:30:35    +0000]
hij  -       -       [15/Jun/2010:08:00:56    +0000]
 kln  -       -       [16/Jun/2010:01:00:34    +0000]

# 2  
Old 06-17-2010
Hi, if you have GNU date you can do this to print dates up to 2 days ago:
Code:
while IFS="$IFS[]:/" read c1 c2 c3 day mon year hour min sec tz; do
  if [ $(date -d "2 days ago" +%s) -le $(date -d "$day $mon $year $hour:$min:$sec +$tz" +%s) ] ; then
    printf "%s\t%s\t%s\t[%s\t%s]\n" $c1 $c2 $c3 $(TZ=PST8PDT date -d "$day $mon $year $hour:$min:$sec +$tz" "+%d/%b/%Y:%H:%M:%S %z")
  fi
done<infile

output:
Code:
abc     -       -       [15/Jun/2010:23:30:04   -0700]
efg     -       -       [17/Jun/2010:16:30:35   -0700]
kln     -       -       [15/Jun/2010:18:00:34   -0700]

Otherwise it gets a lot more complicated and you have to look for shell libraries that are posted on this forum.
Last edited by Scrutinizer; 06-20-2010 at 07:42 AM..
# 3  
Old 06-17-2010
Check the FAQ article:

https://www.unix.com/answers-frequent...rithmetic.html

You should find what you're after in there :-)
# 4  
Old 06-18-2010
Code:
date: invalid date `13 Jun 2010 06:30:04 ++0000]' ./time_pst.sh: line 4: [: 1276600837: unary operator expected

I am getting this error when i run the script .

---------- Post updated at 11:42 PM ---------- Previous update was at 06:22 AM ----------

date: invalid date `13 Jun 2010 06:30:04 ++0000]' error when i run the script. Can you please tell me what is the problem

---------- Post updated 06-18-10 at 01:53 AM ---------- Previous update was 06-17-10 at 11:42 PM ----------

Please tell me why is this error I am getting
# 5  
Old 06-18-2010
I am guessing you do not have GNU date?
# 6  
Old 06-18-2010
Hi,

How to check about the GNU date.
If not can you please tell me what is the other solution which can be used
# 7  
Old 06-18-2010
Code:
date --version

Should say date (GNU coreutils)
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