SDL_SECONDS_TO_NS - Man Page

#include <SDL3/SDL_timer.h>

#define SDL_SECONDS_TO_NS(S)    (((Uint64)(S)) * SDL_NS_PER_SECOND)

This only converts whole numbers, not fractional seconds.

S

the number of seconds to convert.

Returns S, expressed in nanoseconds.

It is safe to call this macro from any thread.

This macro is available since SDL 3.2.0.