'yyyy-mm-dd hh:mm a' inputFormat in 'datetime' function

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Yu Li 2022-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/1657155-yyyy-mm-dd-hh-mm-a-inputformat-in-datetime-function

评论： Yu Li 2022-2-24

采纳的回答： the cyclist

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Hi:

I'm trying to convert a string to datetime, below are the result of two command:

datetime('2022-02-22 9:30 am','InputFormat','yyyy-mm-dd hh:mm a','TimeZone', 'America/New_York')
ans = 22-Jan-2022 09:30:00
datetime('2022-02-22 9:30 am','TimeZone', 'America/New_York')
ans = 22-Feb-2022 09:30:00

the 2nd returns the result I want, but I'm interest to know why the 1st is wrong.

Thanks!

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采纳的回答

the cyclist 2022-2-24

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The warning message you got from the first line tells you exactly what the problem is:

datetime('2022-02-22 9:30 am','InputFormat','yyyy-mm-dd hh:mm a','TimeZone', 'America/New_York')

Warning: The format 'yyyy-mm-dd hh:mm a' contains a field for minute (m) in what appears to be a date portion. You might have intended to use the symbol for month (M) rather than for minute (m). See the datetime.Format property for a complete description of the identifiers used in datetime formats.

ans = datetime

22-Jan-2022 09:30:00

You needed

datetime('2022-02-22 9:30 am','InputFormat','yyyy-MM-dd hh:mm a','TimeZone', 'America/New_York')
ans = datetime
   22-Feb-2022 09:30:00

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the cyclist 2022-2-24

编辑：the cyclist 2022-2-24

Warnings are on by default. In your instance of MATLAB, this warning -- or possibly all warnings -- must have been turned off. I would recommended looking at this documentation, to understand how warnings get suppressed and restored.

Yu Li 2022-2-24