Change Date from dd-mmm-yyyy to mm/dd/yyyy


 
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# 1  
Old 03-27-2008
Change Date from dd-mmm-yyyy to mm/dd/yyyy

I want to change a date from format dd-mmm-yyyy to mm/dd/yyyy. Is there a way to do this with sed or do you have to write a case statement to convert JAN to 01? Thanks
# 2  
Old 03-28-2008
On FreeBSD:
Code:
date -j -f "%d-%b-%Y" "27-Mar-2008" "+%m/%d/%Y"

# 3  
Old 03-28-2008
Maybe I should have mentioned that I am using korn shell. I get an error when using that.

> date "%d-%b-%Y" "27-Mar-2008" "+%m/%d/%Y"
date: bad conversion
# 4  
Old 03-29-2008
Next time you should mention your shell and your OS from the beginning Smilie
Code:
echo "28-Mar-2008" | date -d - "+%m/%d/%Y"

or..
Code:
#!/bin/ksh
d="28-Mar-2008"
date -d $d "+%m/%d/%Y"

You should take a look over man date anyway.
# 5  
Old 03-29-2008
Not all date implementations have all this fancy shmancy stuff. As a matter of fact, on HP-UX or Sun, you should be thankful that it even displays today's date.

If you can't get a good date (sorry, couldn't resist), then yes, sed (or cut, or awk, or perl, or nearly any programming language you happen to know the basics of) can be used to move around parts within the string.

(True story from real life: I had a colleague who needed to remove duplicate lines from a file. I intercepted him when he had exported the file to his University account and loaded it into SPSS which he was more familiar with, but couldn't quite get to do this precise task.)

But yes, you need the month name to number mapping somehow. somebody posted one awk solution the other day, but I can't seem to find it now. If the input is just the date then twelve lines of sed will do it.
# 6  
Old 03-29-2008
Quote:
Originally Posted by stringzz
I want to change a date from format dd-mmm-yyyy to mm/dd/yyyy. Is there a way to do this with sed or do you have to write a case statement to convert JAN to 01? Thanks
Code:
# echo "dd-mmm-yyyy" | awk 'BEGIN{FS="-";OFS="/"}{print $2,$1,$3}'
mmm/dd/yyyy

# 7  
Old 03-29-2008
Add to the BEGIN { m[jan] = 1; m[feb] = 2; ... etc } and there you have it. Like I said, somebody posted code like this I think only yesterday, but I wasn't able to bring it up with a search.
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