Date header value is malformed for the first 9 days of the month.

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This library uses the preferred format, but the value is missing the second digit for the first 9 days of the month, which is not valid according to the spec.

Expected result
Date: Sun, 05 Jan 2025 23:09:13 GMT

Actual result
Date: Sun, 5 Jan 2025 23:09:13 GMT

Hummingbird version: 2.6.1

Operating system: Arch linux (6.12.8-arch1-1)

Swift version: 5.10

swift --version

Swift version 6.0.3 (swift-6.0.3-RELEASE)
Target: x86_64-unknown-linux-gnu

Suspected problem source

hummingbird/Sources/Hummingbird/Utils/DateCache.swift

Line 77 in 7a41c20

formatted += timeStruct.tm_mday.description

Not sure if the Expires, If-Modified-Since or other date related headers are malformed.