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

2022 2 24
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更新时间：2022 2 24
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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!
Yu

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the cyclist
the cyclist 2022-2-24
Ran in:

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Ran in:
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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Yu Li
Yu Li 2022-2-24
thanks... but unfortunately I do not see any warning message while executing the code, may I know your Matlab version? I'm using 2021b.
the cyclist
the cyclist 2022-2-24
I'm using the same version, and also that is what is running here on the Answers forum.
It's possible you have turned off the display of this warning. What does
[msg,warnID] = lastwarn()
give after running the above code?
Yu Li
Yu Li 2022-2-24
[msg,warnID] = lastwarn ()
msg =
'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.'
warnID =
'MATLAB:datetime:FormatConflict_mM'
it just did not appear automatically.
the cyclist
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.

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