Datevector conversion from Excel to Matlab

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Eric Escoto
Eric Escoto 2020년 9월 21일
댓글: Cris LaPierre 2020년 9월 21일
I'm trying to convert an long Excel-format date array and the conversion I normally use is returning incorrect values. The date starts at 3/1/1942.
The format in excel is: 3/1/1942 1:00:00 AM
Below are my lines to import and convert to MATLAB Date Vector and Datenum. I've cleaned up the dataset to only include the date vector from excel. So, ignore the txt, and raw variables.
%% Define file location, and load into the workspace.
stafiles_WGA = 'datevec_raw.xlsx';
% Read the data.
[num_WGA, txt_WGA, raw_WGA] = xlsread(stafiles_WGA); % Creates three variables. A number (double), raw (cell), and txt (cell).
% Note that the 'txt' and 'raw' variables contain the decriptions of the columns.
% Rename the numerical matrix and remove the upper row that originally contained the data headers.
sta_WGA = num_WGA;
datevec_WGA = datetime(sta_WGA,'ConvertFrom','excel');
date_num_WGA = datenum(datevec_WGA);
Any idea what I'm not catching?
Thanks
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Walter Roberson
Walter Roberson 2020년 9월 21일
Is there a reason you are not using readtable() ?
Eric Escoto
Eric Escoto 2020년 9월 21일
Only that I’ve just used this method for all my scripts to date with no issues regarding the date conversions. If there’s a better way I’m fine to try it.

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Cris LaPierre
Cris LaPierre 2020년 9월 21일
I would read them in this way:
data = readtable('datevec_raw.xlsx','ReadVariableNames',false);
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Eric Escoto
Eric Escoto 2020년 9월 21일
편집: Eric Escoto 2020년 9월 21일
Oh, I found the issue way back when I used this line that was provided.
data = readtable('datevec_raw.xlsx','ReadVariableNames',false);
I just changed it and all is well.
stafiles_WGA = readtable('WGA_stationdata_corrected.xlsx','ReadVariableNames',true);
Thanks!
Cris LaPierre
Cris LaPierre 2020년 9월 21일
Yup, or drop the "ReadVariableNames" setting completely, like I showed in my previous response (true is the default setting, so doesn't need to be set explicitely).

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