a question regarding the format of dates

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antonet
antonet 2013-1-31
Dear all, I have an excel file that contains among other columns, a date column. In that column the dates are either in this format '01/02/2009' or in that format ' 03/2009'
For instance
Out={
'Con' dates'
‘SP’ '01/02/2009'
‘kp’ ' 03/2009'}
The problem is that when I import this matrix in Stata then I get something like
Out={
'Con' dates'
‘SP’ 39722
‘kp’ ' 03/2009'}
So all the dates represented in this format '01/02/2009' appear as numbers in stata. Can I fix that within Matlab or within stata?
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the cyclist
the cyclist 2013-1-31
What does it look like if you import directly into MATLAB, rather than Stata?
The space at the beginning of ' 03/2009' suggests to me that field is being interpreted as text, not as a date. You may be able to fiddle with the format within Excel to get them all the same.
antonet
antonet 2013-2-1
编辑：antonet 2013-2-1
In matlab looks like ok when I import this matrix, that is
Out={
'Con' dates'
‘SP’ '01/02/2009'
‘kp’ ' 03/2009'}

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回答（2 个）

Walter Roberson
Walter Roberson 2013-2-1
needfix = strcmpn(Out, ' ', 1);
Out(needfix) = cellfun( @(S) ['01/' S(2:end)], Out(needfix), 'Uniform', 0);
And then convert the dates.
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antonet
antonet 2013-2-1
编辑：antonet 2013-2-1
Could you please give me some help? Am I doing anything wrong?
thank you

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owr
owr 2013-2-1
If I were in your situation, I would try and do the formatting in Excel first and get all dates uniform before importing into MATLAB (or Stata). Excel in my experience seems to be better at "figuring out what you meant".
Try just highlighting and formatting the column in Excel into any fairly normal date format. It will change something like "3/2009" to "3/1/2009" for you. Once data is uniform, import into MATLAB. Even if you have to do this for a number of files it may be quicker in the long run than writing a general date parser in ML.

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