Why didn't my original CountIF formula work?

I am trying to count the number of projects that began since Jan 1, 2024. I typed in the formula =COUNTIF([Start Date]:[Start Date], ">= Jan 1, 2024"). Basically I wanted to count the number of projects with a start date that were equal to Jan 1, 2024 or greater. However that formula gave the blatantly incorrect answer.

Using Smartsheet AI they gave me this formula =COUNTIF([Start Date]:[Start Date], >=DATE(2024, 1, 1)) which gave the correct answer.

But I still have no clue why the original formula I wrote didn't work. Can someone help me out? Thanks!

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