readtable with multiple date formats

21 vues (au cours des 30 derniers jours)
Ramon Sabin
Ramon Sabin le 5 Août 2020
I have to read and concatenate multiple tables which all have the same number of variables. One of these variables is a datetime value which for each table comes in a different format ('dd:MM:yy hh:mm','d/MM/yyyy hh:mm', etc.) All of the formats have in common that the day precedes the month (non-US system).
The problem I have is that if I don't specify the datetime format, matlab defaults to US format in the tables that would accept it; if I specify the format, the datetime entry in the tables which don't match that format read NaT. The problem would be solved if I didn't have to specify the datetime format but could specify the default format to be in non-US style. A nice alternative would be to provide more than one datetime format and let the program pic the one that fits.
I would very much appreciate your help.
  2 commentaires
Ramon Sabin
Ramon Sabin le 5 Août 2020
Thank you. I will try the function and see if I can work something out.

Connectez-vous pour commenter.

Réponse acceptée

Jeremy Hughes
Jeremy Hughes le 6 Août 2020
Without seeing the file, I can only guess, but I'd try the following first:
T = readtable(filename,'DateLocale',locale,...)
Not all of the formats will work in every locale though, so you might want to just import the dates as text,
T = readtable(filename,'DatetimeType','text',...)
Then you can deal with the different formats from in MATLAB, and have the benefit of seeing the data first. I'll open an enhancement request for this.
Hope this helps.

Plus de réponses (1)

Peng Li
Peng Li le 5 Août 2020
A workaround for me I think is to just load that column in string format. After loading you can do some cleaning before you convert it back to datetime. For example, you can replace : with / first to consolidate these strings.


En savoir plus sur Dates and Time dans Help Center et File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by