Check for incorrect argument data type or missing argument in call to function 'dateshift'.

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Palina Pauliuchenka 2021-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1588409-check-for-incorrect-argument-data-type-or-missing-argument-in-call-to-function-dateshift

编辑： the cyclist 2021-11-16

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I have a function that calculates left hours till noon

input time: 18:56:19

output hours till noon: 17:03:41

Rounded hours left till noon, output should be 17:00:00

dateshift('17:03:41', 'start', 'hour', 'nearest');

Output: 17:00:00

But when my input hours are less 12 hours it throughs an error:

input time: 06:01:31

output hours till noon: 05:58:29

Rounded hours left till noon, output should be 06:00:00

dateshift('06:01:31', 'start', 'hour', 'nearest');

Check for incorrect argument data type or missing argument in call to function 'dateshift'.

Error in hoursLeftTillNoon (line 64)

hoursLeft = dateshift(hoursLeft, 'start', 'hour', 'nearest');

hoursLeft = output hours till noon

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Answer 1

the cyclist 2021-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1588409-check-for-incorrect-argument-data-type-or-missing-argument-in-call-to-function-dateshift#answer_833174

编辑：the cyclist 2021-11-16

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I get the error from your first statement as well:

% This statement would give an error
% dateshift('17:03:41', 'start', 'hour', 'nearest')

But not if I use a datetime as input:

dateshift(datetime('17:03:41'), 'start', 'hour', 'nearest')
ans = datetime
   16-Nov-2021 17:00:00

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Palina Pauliuchenka 2021-11-16

But why it works when my time is 17:03:34 later rounded to 17:00:00 but not with 05:58:29? I don't understand.

the cyclist 2021-11-16

编辑：the cyclist 2021-11-16

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I tried to replicate an example where hoursLeft is 17:03:01 using your code:

time1 = datetime('02:56:19', 'Format', 'HH:mm:ss');
time2 = datetime('20:00:00', 'Format', 'HH:mm:ss');
hoursLeft = time2 - time1;
hoursLeft = dateshift(hoursLeft, 'start', 'hour', 'nearest');
Check for incorrect argument data type or missing argument in call to function 'dateshift'.

I believe this fails because hoursLeft is a duration, not a datetime.

So, I'm sorry, but I'm still confused about the exact code that does work, and the code that does not. Can you please provide a complete example of each case, that we can run?

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