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Changing from Excel date format to MySQL date format

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# 1  
Old 08-11-2009
Changing from Excel date format to MySQL date format

I have a list of dates in the following format: mm/dd/yyyy and want to change these to the MySQL standard format: yyyy-mm-dd.
The dates in the original file may or may not be zero padded, so April is sometimes "04" and other times simply "4".
This is what I use to change the format:
sed -i '' -e "s_\(..\)/\(..\)/\(....\)_\3-\1-\2_" dates.txt

but because of the dual dots (.), it will not match with single digits. I have also tried:
sed -i '' -e "s_\(\d{1,2}\)/\(\d{1,2}\)/\(\d{4}\)_\3-\1-\2_" dates.txt

but somehow that hasn't worked either and returns the same file. So how do I create the correct regex and what is wrong with the second regex?
# 2  
Old 08-11-2009
Try this:

sed 's_\([^/]*\)/\(.*\)/\(.*\)_\3-\2-\1_'

With awk:

awk -F/ '{print $3"-"$2"-"$1}'


Last edited by Franklin52; 08-11-2009 at 05:11 PM.. Reason: added awk solution
# 3  
Old 08-11-2009
Thanks, that worked. I have a penchant for sed, so will use that.

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