I have a CSV file with date and time values I want to import and convert to datetime

18 次查看（过去 30 天）
Tim Moriarty
Tim Moriarty 2016-4-5
评论： dpb 2016-4-5
The import tool will not convert this to Datetime and I have tried many different options all of which will not allow me to convert the dates in this CSV file to datetime. Example of the format of the dates in the CSV file: {'1/1/2015 1:00:00 AM'} The format of the data is Month/Day/Year Hour:Min:Second AM or PM There are no "0"s infront of any of the month or day values. I have tried MM/DD/YYYY and many different versions of this format
Code that does not work:
DateStrings = importfile(:,'DateTime');
t = datetime(DateStrings,'InputFormat','M/d/y h:MM:SS a');
The clock values are a 12 hour clock as they start at just a date value and then the next value has the hour data and the AM/PM. Any help would be greatly appreciated!

请先登录，再回答此问题。

采纳的回答

dpb
dpb 2016-4-5
Use
t = datetime(DateStrings,'InputFormat','M/d/y h:mm:ss a');
instead. 'MM' --> Months and 'SS' --> fractional seconds fields. See <datetime-properties Format>
  2 个评论
Tim Moriarty
Tim Moriarty 2016-4-5
I used your code and this still comes up Error using datetime (line 613) Input data must be a numeric or a cell array or char matrix containing date/time strings. It is in a table as text '1/1/2015 1:00:00 AM'
dpb
dpb 2016-4-5
Well, you didn't say that...extract the table column into a cell array or string array as instructed.

请先登录，再进行评论。

更多回答（1 个）

Kuifeng
Kuifeng 2016-4-5
%After you have the strings of DateStrings, try the following
formatOut = 'dd mmm yyyy HH:MM:SS AM';
t=datestr(datenum(DateStrings,'dd/mm/yyyy HH:MM:SS',1900),formatOut)
  1 个评论
Tim Moriarty
Tim Moriarty 2016-4-5
The following works then I just have to join the two variables and put back to the origianl variable S = importfile{:,3}; DateStrings = S(:,1);
t = datetime(DateStrings,'InputFormat','M/d/y h:mm:ss a'); t1 = datetime(DateStrings,'InputFormat','M/d/y');

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Dates and Time 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by