File structure cannot be determined

I am trying to upload a very basic csv file, however elastic keeps throwing me the "File structure cannot be determined" error. I'm attaching a picture of my csv file here. I've made sure all the time formats are the same. I even tried uploading another file with multiple dates and that worked fine. Is there something incorrect with my file? Thank you in advance!

I would open/view it in a text editor so you can see what the file actually looks like. Open in Notepad or similar program.

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