30 Time library [time]

30.10 12/24 hours functions [time.12]

1
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These functions aid in translating between a 12h format time of day and a 24h format time of day.
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constexpr bool is_am(const hours& h) noexcept;
2
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Returns: 0h <= h && h <= 11h.
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constexpr bool is_pm(const hours& h) noexcept;
3
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Returns: 12h <= h && h <= 23h.
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constexpr hours make12(const hours& h) noexcept;
4
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Returns: The 12-hour equivalent of h in the range [1h, 12h].
If h is not in the range [0h, 23h], the value returned is unspecified.
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constexpr hours make24(const hours& h, bool is_pm) noexcept;
5
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Returns: If is_pm is false, returns the 24-hour equivalent of h in the range [0h, 11h], assuming h represents an ante meridiem hour.
Otherwise, returns the 24-hour equivalent of h in the range [12h, 23h], assuming h represents a post meridiem hour.
If h is not in the range [1h, 12h], the value returned is unspecified.