How to read time as string data from excel file

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Yasuyuki Hamanaka
Yasuyuki Hamanaka 2021-5-24
评论： Yasuyuki Hamanaka 2021-5-24
I used readtable to read time from excel spread sheets. The time was converted to double like e.x. But I want to read time as original form. How does read time as string?
e.x 10:11:09 AM => 0.42858

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采纳的回答

Yutaka Yamada
Yutaka Yamada 2021-5-24
How about the below code if you want to use readtable?
opts = detectImportOptions('readTime.xlsx');
opts.VariableTypes = 'datetime';
T = readtable('readTime.xlsx', opts);
for i = 1:3
a = T{i, 1};
a.Format = 'HH:mm:ss a';
end
I've attached the Excel file that I've used for this test also.
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Yasuyuki Hamanaka
Yasuyuki Hamanaka 2021-5-24
Thank you both for answering. Actually the spreadsheet is the picture below. I want to read Var1 as date, Var2 as time and Var 3 and 4 asdouble. Do you know how to specify the format of each columns, if there's multiple variables?
Yasuyuki Hamanaka
Yasuyuki Hamanaka 2021-5-24
I found the function setvaropts.
opts = detectImportOptions('input.xlsx');
opts = setvartype(opts,{'Var2'},'datetime');
opts = setvaropts(opts,{'Var2'},'DatetimeFormat','HH:mm:ss a');
schedule = readtable('input.xlsx',opts);
Thank you everyone for helping me. Your information were very helpful and I learned a lot.

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更多回答（1 个）

Sulaymon Eshkabilov
Hi,
You should try using xlsread() in this case. In fact, xlsread is slower than readtable().
Then you can employ datenum() and datestr() if necessary.
Good luck.
  1 个评论
Yasuyuki Hamanaka
Yasuyuki Hamanaka 2021-5-24
Thank you for answering my question. I want to use readtable because the amount of data is so large that reading data takes long. But I didn't know the fucntion of datenum() and datestr(), so it is very helpful for me.

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