std::chrono::month::month(3)

NAME
std::chrono::month::month - std::chrono::month::month

Synopsis
   month() = default; (1) (since C++20)
   constexpr explicit month( unsigned m ) noexcept; (2) (since C++20)
   Constructs a month object.
   1) Default constructor leaves the month value uninitialized.
   2) If m <= 255, constructs a month object holding the month value m. Otherwise the
   value held is unspecified.