Excel date import issues, dates being turned into numbers

[johnwards]

Hey, so when we use this library to import columns that are formated as Dates via Excel in the preview and in the data we get out after import the dates are now numbers.

I had a quick chat with chatgpt and it says:
In Excel, dates are stored as numbers internally, where the number represents the number of days since January 1, 1900. The value 45581 corresponds to October 16, 2024.

I'd have expected the library to handle this especially if we set the data_type to be a date, but it doesn't seem to do that, nor can I find any code using the types.

We're going to put something in our server code to convert it back to a Date, but the UI preview issue is still there which isn't great.

My suggestion to fix:

1. If the field is date type
2. If value is numeric, convert to date
3. Have the ability to pass in the format you want the date type in. eg The world majority format DD/MM/YYYY or American MM/DD/YYYY etc