text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
  
  // <chrono>
  // class year_month_day;
  
  //  constexpr year_month_day(const year_month_day_last& ymdl) noexcept;
  //
  //  Effects:  Constructs an object of type year_month_day by initializing
  //              y_ with ymdl.year(), m_ with ymdl.month(), and d_ with ymdl.day().
  //
  //  constexpr chrono::year   year() const noexcept;
  //  constexpr chrono::month month() const noexcept;
  //  constexpr chrono::day     day() const noexcept;
  //  constexpr bool             ok() const noexcept;
  
  #include <chrono>
  #include <type_traits>
  #include <cassert>
  
  #include "test_macros.h"
  
  int main(int, char**)
  {
      using year                = std::chrono::year;
      using month               = std::chrono::month;
      using day                 = std::chrono::day;
      using month_day_last = std::chrono::month_day_last;
      using year_month_day_last = std::chrono::year_month_day_last;
      using year_month_day      = std::chrono::year_month_day;
  
      ASSERT_NOEXCEPT(year_month_day{std::declval<const year_month_day_last>()});
  
      {
      constexpr year_month_day_last ymdl{year{2019}, month_day_last{month{1}}};
      constexpr year_month_day ymd{ymdl};
  
      static_assert( ymd.year()  == year{2019}, "");
      static_assert( ymd.month() == month{1},   "");
      static_assert( ymd.day()   == day{31},    "");
      static_assert( ymd.ok(),                  "");
      }
  
      {
      constexpr year_month_day_last ymdl{year{1970}, month_day_last{month{4}}};
      constexpr year_month_day ymd{ymdl};
  
      static_assert( ymd.year()  == year{1970}, "");
      static_assert( ymd.month() == month{4},   "");
      static_assert( ymd.day()   == day{30},    "");
      static_assert( ymd.ok(),                  "");
      }
  
      {
      constexpr year_month_day_last ymdl{year{2000}, month_day_last{month{2}}};
      constexpr year_month_day ymd{ymdl};
  
      static_assert( ymd.year()  == year{2000}, "");
      static_assert( ymd.month() == month{2},   "");
      static_assert( ymd.day()   == day{29},    "");
      static_assert( ymd.ok(),                  "");
      }
  
      { // Feb 1900 was NOT a leap year.
      year_month_day_last ymdl{year{1900}, month_day_last{month{2}}};
      year_month_day ymd{ymdl};
  
      assert( ymd.year()  == year{1900});
      assert( ymd.month() == month{2});
      assert( ymd.day()   == day{28});
      assert( ymd.ok());
      }
  
    return 0;
  }
  