Datetime to string format issue

Question

Dharmesh Joshi 2022-11-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1856733-datetime-to-string-format-issue

回答： Dharmesh Joshi 2022-11-20

采纳的回答： Steven Lord

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Hi

I have a datetime array as shown below.

timearray_segmenta = 
  struct with fields:
    start: [2022-09-06T00:00:00    2022-09-16T00:00:00    2022-09-26T00:00:00    2022-10-06T00:00:00    2022-10-16T00:00:00    2022-10-26T00:00:00    …    ]
     stop: [2022-09-15T23:59:59    2022-09-25T23:59:59    2022-10-05T23:59:59    2022-10-15T23:59:59    2022-10-25T23:59:59    2022-11-04T23:59:59    …    ]

The formate of the date time has to be as shown above, this was achived using:

timearray.Format = 'yyyy-MM-dd''T''HH:mm:ss';

I need to convert this datetime structure as a string, so i am using the following:

     K>> datestr(timearray_segmenta.start)
ans =
  7×11 char array
    '06-Sep-2022'
    '16-Sep-2022'
    '26-Sep-2022'
    '06-Oct-2022'
    '16-Oct-2022'
    '26-Oct-2022'
    '05-Nov-2022'

The formate changes, if i was to reassign the formate i get the following:

    datestr(timearray_segmenta.start,timearray.Format )
ans =
  7×21 char array
    '2022-00-06'T'00:09:00'
    '2022-00-16'T'00:09:00'
    '2022-00-26'T'00:09:00'
    '2022-00-06'T'00:10:00'
    '2022-00-16'T'00:10:00'
    '2022-00-26'T'00:10:00'
    '2022-00-05'T'00:11:00'

What needs to change in my code?

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Stephen23 2022-11-19

"What needs to change in my code?"

Get rid of deprecated and superfluous DATESTR. Just set the DATETIME format:

https://www.mathworks.com/help/matlab/ref/datetime.html#d124e322956

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Answer 1

Steven Lord 2022-11-19

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Don't use datestr. As its documentation page states, it is not recommended. Use string or char instead.

dt = datetime('now');
dt.Format = 'yyyy-MM-dd''T''HH:mm:ss'
dt = datetime
   2022-11-19T13:28:00
s = string(dt)
s = "2022-11-19T13:28:00"

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Answer 2

dpb 2022-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/1856733-datetime-to-string-format-issue#answer_1105273

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>> datetime(start,'InputFormat','yyyy-MM-dd''T''HH:mm:ss')
ans = 
  datetime
   06-Sep-2022
>> datetime(start,'InputFormat','yyyy-MM-dd''T''HH:mm:ss','Format','yyyy-MM-dd''T''HH:mm:ss')
ans = 
  datetime
   2022-09-06T00:00:00
>> string(ans)
ans = 
    "2022-09-06T00:00:00"
>> 