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Metadata: Move timezone related functions to /pkg/time/tz #4622 #4946
Metadata: Improve timezone parsing in /pkg/time/tz #4622 #4946
CI: Apply Go linter recommendations to remaining "pkg/..." code #5330
Test: Use PascalCase names for all Go subtests in /pkg
Metadata: Fix typo in LocationUTC() function #4622 #4946
Tests: Add unit tests
Links: Use canonical trailing-slash form for website URLs