fix: removed csvFormat() and kept UTC format

[akashs056]

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What's changed?

I have updated the code to remove the csvFormat() function and instead kept the UTC format with the "Z" for both date and dueDate. After testing, it works perfectly fine and correctly handles the UTC time. The export and import processes function smoothly without any issues.

Does this PR close any GitHub issues? (do not delete)

• Closes [BUG] Incorrect time shown in exported csv file #3422

[akashs056]

I didn't use the latest time converter you implemented, but this solution also works fine for the current issue