Date Parsing Error for Time 00:00:00 from MS Excel

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Motasem Mustafa
Motasem Mustafa am 22 Okt. 2020
Kommentiert: Peter Perkins am 18 Nov. 2020
Dears,
I am using the code below to do parsing for date-time cells in an MS Excel sheet with date-time form of ( 01/05/2019 00:00) as in the screenshot below.
clc,clear,close all;
[num1,data] = xlsread('Book_new.xlsx','sheet1','A1:A30');
a=datevec(data,'dd/mm/yyyy HH:MM:SS');
date=datestr(datenum(a),'dd/mm/yyyy');
time=datestr(datenum(a),'HH:MM:SS');
Year=datestr(datenum(a),'yyyy');
mm=datestr(datenum(a),'mm');
dd=datestr(datenum(a),'dd');
yy=datestr(datenum(a),'yyyy');
[status,message] =xlswrite('motasem.xlsx',str2num(yy),'sheet1','A1:A30');
[status,message] =xlswrite('motasem.xlsx',str2num(mm),'sheet1','B1:B30');
[status,message] =xlswrite('motasem.xlsx',str2num(dd),'sheet1','C1:C30');
[status,message] =xlswrite('motasem.xlsx',string(time),'sheet1','D1:D30');
When I run the code for example for the 1st 30 readings (half hourly readings) it gives me the following error :
"Error using dtstr2dtvecmx
Failed to convert from text to date number.
Error in datevec (line 123)
y = dtstr2dtvecmx(t,icu_dtformat);
Error in motasem (line 4)
a=datevec(data,'dd/mm/yyyy HH:MM:SS');"
But when I change the range of data to avoid the first reading which contains the time 00:00:00 it works and gives the below output :
Any suggestions please ?
  2 Kommentare
Walter Roberson
Walter Roberson am 22 Okt. 2020
As usual our suggestion is to use readtable instead of xlsread.
Motasem Mustafa
Motasem Mustafa am 23 Okt. 2020
Thanks I have solved this using your suggestion of using readtable :)

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Antworten (1)

Motasem Mustafa
Motasem Mustafa am 23 Okt. 2020
The new code that worked .
Thanks @ Walter Roberson
clc,clear,close all;
data = readtable('Book_new.xlsx','Range','A1:A60','ReadVariableNames',false);
A = table2array(data);
yy=datestr(datenum(A),'yyyy');
mm=datestr(datenum(A),'mm');
dd=datestr(datenum(A),'dd');
time=datestr(datenum(A),'HH:MM:SS');
[status,message] =xlswrite('motasem.xlsx',str2num(yy),'sheet1','A1:A30');
[status,message] =xlswrite('motasem.xlsx',str2num(mm),'sheet1','B1:B30');
[status,message] =xlswrite('motasem.xlsx',str2num(dd),'sheet1','C1:C30');
[status,message] =xlswrite('motasem.xlsx',string(time),'sheet1','D1:D30');
  3 Kommentare
Motasem Mustafa
Motasem Mustafa am 26 Okt. 2020
Thanks alot for your support :)
Peter Perkins
Peter Perkins am 18 Nov. 2020
Yes, as Walter says, don't use datenum. There are datetime methods like year and ymd for all of those things you are exporting. You do not need to convert datetimes to datenums, to datestrs, to numeric.
Also, I strongly recommend that you look at writetable instead of xlswrite. Create separate y/m/d and time of day variables in the table, and you can write it all out in one line.

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