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std::chrono::time_of_day::make12, std::chrono::time_of_day::make24

constexpr void make12() noexcept;
 (1) 
constexpr void make24() noexcept;
 (2)

Changes the output format.

1) If the current output format is 24-hour, converts to 12-hour time. Otherwise no effects.
2) If the current output format is 12-hour, converts to 24-hour time. Otherwise no effects.

Notes

It is not possible to query the current output format.

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