ValueError time data 202011 doesnt match format Y-m-d HMS at position 1461 You might want to try - passing format if your strings have a consistent format; - passing format=ISO8601 if your strin

The error message you're seeing is a ValueError raised by the datetime.strptime() function. This error occurs when the input string does not match the specified format.

In your case, the input string "2020/1/1" does not match the format "%Y-%m-%d %H:%M:%S". The format "%Y-%m-%d %H:%M:%S" expects the date and time to be in the format YYYY-MM-DD HH:MM:SS.

To resolve this error, you have a few options:

1. Pass the correct format string: If your input string is in the format YYYY/MM/DD, you should change the format string to "%Y/%m/%d".

   datetime.strptime("2020/1/1", "%Y/%m/%d")
   

2. Use the format='ISO8601' argument: If your input strings are all in the ISO8601 format but not necessarily in the exact same format, you can use the format='ISO8601' argument:

   datetime.fromisoformat("2020/1/1")
   

3. Use the format='mixed' argument: If your input strings have mixed formats, you can use the format='mixed' argument. The format will be inferred for each element individually. You might also want to use the dayfirst argument alongside this:

   datetime.strptime("2020/1/1", format='mixed', dayfirst=True)
   

Choose the option that best suits your data and update your code accordingly to fix the ValueError you're encountering.