Code Quality Changes

Added

• Added an interface

Changed

• Enabled strict types
• Moved constants from the class to the interface
• Changed references to constants to use the interface constants
• Changed occurrences of new self to new static
• Changed return type declarations to return the interface instead of self
• Formatted code and tests

Minor Fixes

Changed

• Changed the visibility of the constructor and $seconds property.

Removed

• Removed an unnecessary return $this in the constructor of the Duration class.

Initial Release

Initial release.

Exciting!