- P1361 Integration of chrono with text formatting
- P2372 Fixing locale handling in chrono formatters
- LWG3270 Parsing and formatting %j with durations
- P1650R0 std::chrono::days with 'd' suffix
- LWG3262 Formatting of negative durations is not specified
- LWG3314 Is stream insertion behavior locale dependent when Period::type is micro?