diff --git a/include/fmt/chrono.h b/include/fmt/chrono.h
index 8f5426f2..cf1db1ee 100644
--- a/include/fmt/chrono.h
+++ b/include/fmt/chrono.h
@@ -584,6 +584,10 @@ template <typename Period> FMT_CONSTEXPR inline const char* get_units() {
   if (std::is_same<Period, std::exa>::value) return "Es";
   if (std::is_same<Period, std::ratio<60>>::value) return "m";
   if (std::is_same<Period, std::ratio<3600>>::value) return "h";
+  if (std::is_same<Period, std::ratio<86400>>::value) return "d";
+  if (std::is_same<Period, std::ratio<604800>>::value) return "wk";
+  if (std::is_same<Period, std::ratio<2629746>>::value) return "mo";
+  if (std::is_same<Period, std::ratio<31556952>>::value) return "a";
   return nullptr;
 }