Fix GH-10766: PharData archive created with Phar::Zip format does not keep files metadata (datetime)

Due to an incorrect check, the datetime was never actually set.
To test this we need

Fix GH-10766: PharData archive created with Phar::Zip format does not keep files metadata (datetime)

Due to an incorrect check, the datetime was never actually set.
To test this we need to write the file using phar, but read the file
using a different method to not get a cached, or a value that's been
transformed twice and is therefore accidentally correct.

Closes GH-10769

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