Date format changed after csv files imported to current excel workbook

Greetings all.

I am a VBA newbie, currently studying and working on a personal project importing multiple .csv documents into my current workbook with their own different sheet, but I'm stuck at a stage where after csv files been imported to my current workbook, some dates are converted to mm/dd/yyyy, while their original formates are dd/mm/yyyy in csv. Also, some of the dates changed to 'general' type. As I am using dd/mm/yyyy format and aim to run date range filter, it always gave me incorrect outcome. I have now located the issue and have no idea how to fix them.

After I run the followling macro, it imports my selected csv files and merge them with my current workbook, and the flexibility is my greatly prefered. It just the date format that confusing me. I have attached file1.csv which is one of my original file.

Currnet VBA I am using as follows.

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After I run the macro, the dates becomes totally different as what shown on csv file. see attachment 'Screen Capture' (list on the left side are incorrect data, left aligned are general type and right aligned are mm/dd/yyyy, and list on the right side are original data, which are what I wantted).

Hope I have explained my confusion.

Please kindly advise how can I fix the problem. Any help would be greatly appreciated. Thank you

Hi, welcome to the forum,
I suggest you read the rules and see how to mark code as code in your text.
I haven/t looked at your file but date format differences occur when the system settings differ. csv files are text files so make sure that you configure the date fields as date when reading them in Excel, You can do this the moment you read the csv file.
If you start over and record a macro to import the csv file into an existing sheet, you will get the dialog in Excel and there you can set the format for the columns as you go, after you've done this look at the recorded code and you will see that the date columns have another type definition as the cells formatted as General or Integer or whatever.
If I would import your csv file on my system with Dutch settings then the date will look different too and maybe even incorrect, 11/09/2018 which I would interprest at September 11 2018 could become November 9 2018, this would happen with all dates where the day is less than 13

I recorded a macro doing that

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As you can see the first column is set as a date column, that is what the 4 stands for
I get the same result you did so I honestly think it's a question on date settings.

@Vraag en antwoord: What about the date settings? There is no issue that requires error handling

Jason, welcome to the forum

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Hi Jason,
I like the Office Version you show in your profile 1830? New one for me
Excel allows any length of filenames but I and thinking you mean Worksheet Tabs.
That is true, the Sheet's tabs are limited to 31 characters.

What I did is the following using a code like shown here

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The only thins is that you will need to add a routine to check if the tab name already exists, since if you have more than one file where the first 31 characters is the same then you will need to add a counter.
You could also do this with an On Error Trap

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If you get stuck, just let us know

Yes, I have some code for that too and also for the worksheet names to number them if the left 31 are the same