Identifying errors in datetime input strings
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During application development using appdesigner, I want to check that an input string is a time object or not.
As an example, a correct string input does not generate any errors:
str = "31/05/2022" ;
datetime(str,"Format","dd/MM/uuuu")
which returns:
ans =
datetime
31/05/2022
However, when the input string does not match with a true date, then an error follows:
str = "32/05/2022" ;
datetime(str,"Format","dd/MM/uuuu")
Error using datetime
Unable to convert '32/05/2022' to datetime using the format 'dd/MM/uuuu'.
Is there any way to check that the input string corresponds to a date or not, without generating any errors? I intend to compile the code at the end of the project, so I cannot use the try catch statements, since they were not supported by MATLAB Coder up to now (which is a bit of a shame, considering the prices of the coder and the compiler...).
Any suggestion to deal with that issue?
2 commentaires
Stephen23
le 11 Mai 2023
Modifié(e) : Stephen23
le 11 Mai 2023
"Is there any way to check that the input string corresponds to a date or not"
Of course, but it depends on how broad you want to check the input data:
Can the values be negative as well?
Can the months also be out of range?
Can non-digit characters occur?
Réponse acceptée
Star Strider
le 11 Mai 2023
Modifié(e) : Star Strider
le 11 Mai 2023
If you already know the date fields for day, month, and year, one approach would be to use the eomday function to determine the maximum number of days in a month for the matching month and year —
str = "32/05/2022" ;
flds = strsplit(str,'/')
dmax = eomday(str2double(flds(3)),str2double(flds(2)))
Check = 1 <= str2double(flds(1)) & str2double(flds(1)) <= dmax
So in this instance, the day value is not appropriate.
.
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