refactor: parseHttpDate

[Uzlopak]

This PR modifies the parseHttpDate function by adding jsdoc, and doing two major changes:

• the weekday is checked
• rfc850 dates process the year according to RFC 6265

At one point i took the unit tests of the npm package http-dates, which tests for the correct weekday, but it doesnt convince me personally. We can of course remove the weekday check.

The rfc850 year logic is imho more important.

Also it increases the performance significantly.

before:

parseHttpDate
┌─────────┬───────────┬──────────────────┬──────────────────┬────────────────────────┬────────────────────────┬─────────┐
│ (index) │ Task name │ Latency avg (ns) │ Latency med (ns) │ Throughput avg (ops/s) │ Throughput med (ops/s) │ Samples │
├─────────┼───────────┼──────────────────┼──────────────────┼────────────────────────┼────────────────────────┼─────────┤
│ 0       │ 'asctime' │ '711.54 ± 0.25%' │ '662.00 ± 22.00' │ '1485599 ± 0.01%'      │ '1510574 ± 49488'      │ 1405401 │
│ 1       │ 'rfc850'  │ '873.87 ± 2.17%' │ '814.00 ± 9.00'  │ '1206639 ± 0.01%'      │ '1228501 ± 13434'      │ 1144333 │
│ 2       │ 'imf'     │ '767.61 ± 0.30%' │ '705.00 ± 24.00' │ '1410214 ± 0.02%'      │ '1418440 ± 49989'      │ 1302746 │
└─────────┴───────────┴──────────────────┴──────────────────┴────────────────────────┴────────────────────────┴─────────┘

after:

parseHttpDate
┌─────────┬───────────┬──────────────────┬──────────────────┬────────────────────────┬────────────────────────┬─────────┐
│ (index) │ Task name │ Latency avg (ns) │ Latency med (ns) │ Throughput avg (ops/s) │ Throughput med (ops/s) │ Samples │
├─────────┼───────────┼──────────────────┼──────────────────┼────────────────────────┼────────────────────────┼─────────┤
│ 0       │ 'asctime' │ '297.08 ± 0.21%' │ '263.00 ± 4.00'  │ '3676255 ± 0.01%'      │ '3802281 ± 58722'      │ 3366096 │
│ 1       │ 'rfc850'  │ '332.98 ± 0.25%' │ '306.00 ± 11.00' │ '3278293 ± 0.01%'      │ '3267974 ± 121857'     │ 3003188 │
│ 2       │ 'imf'     │ '326.61 ± 5.11%' │ '284.00 ± 4.00'  │ '3438115 ± 0.01%'      │ '3521127 ± 50302'      │ 3061736 │
└─────────┴───────────┴──────────────────┴──────────────────┴────────────────────────┴────────────────────────┴─────────┘

This relates to...

Rationale

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Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[Copilot]

Pull Request Overview

This PR refactors the parseHttpDate function to improve performance and correctness by adding JSDoc documentation, implementing weekday validation, and updating RFC850 year parsing to comply with RFC 6265.

• Replaces string-based parsing with character code validation for better performance
• Adds weekday validation to ensure dates match their specified day of the week
• Updates RFC850 two-digit year handling according to RFC 6265 (70-99 → 1970-1999, 00-69 → 2000-2069)

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
lib/util/date.js	Complete rewrite of date parsing functions with character-level validation and weekday checking
test/utils/date.js	Extensive test additions including fuzzing tests and corrected weekday values in existing tests
benchmarks/utils/date.mjs	New benchmark file for performance testing the parseHttpDate function
benchmarks/package.json	Added tinybench dependency for benchmarking

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[mcollina]

lgtm