date difference in JavaScript

What this snippet does

Dates are numbers under the hood — subtracting two Date objects gives milliseconds, which you convert to any unit.

Expected output

365
14
2024-01-31

Why practise typing this

Typing date code builds muscle memory for the symbols and indentation JavaScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.

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