v1.5.0

• Add DayOfWeek::distanceTo() for forward (wrap-around) day distance calculations.
• Update TimeOfDay::fromString() to accept HH:MM:SS and discard seconds.
• Expand PHPUnit coverage and README examples for both features.

v1.4.0

• Add DayOfWeek (ISO-8601 weekday enum) and TimeOfDay (HH:MM value object) with corresponding tests and README documentation.
• Refactor Duration to use an internal Seconds value object, introduce InvalidSeconds, add divide(), and switch to from*() factories + toSeconds() accessor.
• Rename Period::of() to Period::from() and update usages across tests and README.

v1.3.0

• Introduces Duration (unsigned seconds-based quantity) with arithmetic, comparisons, and unit conversions.
• Introduces Period (half-open interval [from, to)) with validation plus contains() and overlapsWith() logic.
• Extends Instant with plus(), minus(), durationUntil(), and comparison helpers.
• Updates tests and README accordingly.

v1.2.0

• Added DatabaseDateTimeDecoder to parse database timestamp strings with space separator and optional microsecond precision.
• Added comprehensive test coverage for database format parsing including edge cases.
• Updated README with documentation and examples for database timestamp parsing.

v1.1.0

• Implemented findByIdentifierOrUtc method in Timezones class to return a matching timezone or UTC if not found.
• Updated README.md with usage example for the new method.
• Added tests for findByIdentifierOrUtc to ensure correct functionality.

v1.0.0

• Introduces Instant (UTC-normalized) with string decoding and Unix-seconds constructors, plus formatting/accessors.
• Adds Timezone and Timezones collection utilities (construction, lookup, conversion).
• Adds CI configuration with GitHub Actions for automated testing and code analysis.
• Enhanced README with project overview and usage instructions.