Worked on the fmtlib/fmt repository to enhance time-handling capabilities by implementing a template parameter expansion for the utc_clock’s to_sys function. This addition enabled the function to flexibly support multiple time representations, improving interoperability between user code and external systems. The approach focused on C++ template programming and careful library design to broaden compatibility while maintaining API stability. By expanding the fallback to_sys function with a new parameter, the work laid the groundwork for future integrations of additional time types. The contribution demonstrated depth in C++ development and template programming, addressing nuanced requirements in time conversion without introducing breaking changes.