datetime InputFormat is returning month for minutes

6 次查看（过去 30 天）
Scott
Scott 2025-7-18
移动：Walter Roberson 2025-7-22
I'm very confused by the behavior of the datetime InputFormat string in MATLAB.
I have a date string such as "2025040901:42:23 PM"
I believe I am correctly using MM for two-digit month and mm for twelve-hour two-digit minutes. Why is the month always being returned as the minutes?
>> s = "2025040901:42:23 PM"
s =
"2025040901:42:23 PM"
>> datetime(s, 'InputFormat', 'yyyyMMddhh:mm:ss a')
ans =
datetime
2025-04-09 13:04:23
Change the month to prove that that is what is being shown.
>> s = "2025060901:42:23 PM"
s =
"2025060901:42:23 PM"
>> datetime(s, 'InputFormat', 'yyyyMMddhh:mm:ss a')
ans =
datetime
2025-06-09 13:06:23

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2025-7-18
编辑：Fangjun Jiang 2025-7-18
Ran in:
It is correct running your code here in R2024b.
s = "2025040901:42:23 PM";
datetime(s, 'InputFormat', 'yyyyMMddhh:mm:ss a')
ans = datetime
09-Apr-2025 13:42:23
s = "2025060901:42:23 PM";
datetime(s, 'InputFormat', 'yyyyMMddhh:mm:ss a')
ans = datetime
09-Jun-2025 13:42:23
  1 个评论
Scott
Scott 2025-7-18
Thank you. Yes, I tried it on another installation and it worked fine there. Something must be weirdly corrupted on this system. Thank you for checking it out.

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更多回答（1 个）

Scott
Scott 2025-7-22
移动：Walter Roberson 2025-7-22
And to follow-up, I found that my preferences for the default date and time format (Preferences, MATLAB, Command Window) was mistakenly using "MM" for minutes, as in:
So the underlying data was correct, it was the display of the data that was incorrect. I don't know how this preference got set, but I'll take the blame for now.

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