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std::chrono::duration<Rep,Period>::zero

static constexpr duration zero();
 (until C++20) 
static constexpr duration zero() noexcept;
 (since C++20)

Returns a zero-length duration.

If the representation rep of the duration requires some other implementation to return a zero-length duration, std::chrono::duration_values can be specialized to return the desired value.

Parameters

(none).

Return value

returns duration(std::chrono::duration_values<rep>::zero()).

Example

#include <chrono>
#include <ratio>
int main() {
    static_assert((std::chrono::hours::zero() == std::chrono::nanoseconds::zero()) &&
                  (std::chrono::duration<short, std::nano>::zero() ==
                   std::chrono::duration<int, std::deci>::zero()) &&
                  (std::chrono::duration<short, std::deca>::zero() ==
                   std::chrono::duration<long, std::exa>::zero()) &&
                  (std::chrono::duration<long, std::atto>::zero().count() ==
                   std::chrono::duration<float, std::exa>::zero().count()));
}

See also

[static]
 returns the special duration value min
(public static member function)
[static]
 returns the special duration value max
(public static member function)

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https://en.cppreference.com/w/cpp/chrono/duration/zero