Worked on the simonmichael/stackage repository to restore robust timezone support by re-enabling the tz and tztime packages within the build constraints. Addressed a critical regression that had disabled timezone-dependent features, ensuring that downstream projects could once again rely on accurate timestamp handling. Focused on build system configuration using YAML, the solution stabilized both build and deployment pipelines by explicitly managing timezone dependencies. This approach reduced runtime failures in workflows sensitive to timezones and improved the reliability of time-related functionality across various code paths. The work demonstrated careful attention to dependency management and regression resolution within a complex build environment.