# SDL_SECONDS_TO_NS Convert seconds to nanoseconds. ## Header File Defined in [<SDL3/SDL_timer.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_timer.h) ## Syntax ```c #define SDL_SECONDS_TO_NS(S) (((Uint64)(S)) * SDL_NS_PER_SECOND) ``` ## Macro Parameters | | | | ----- | --------------------------------- | | **S** | the number of seconds to convert. | ## Return Value Returns S, expressed in nanoseconds. ## Remarks This only converts whole numbers, not fractional seconds. ## Thread Safety It is safe to call this macro from any thread. ## Version This macro is available since SDL 3.2.0. ---- [CategoryAPI](CategoryAPI), [CategoryAPIMacro](CategoryAPIMacro), [CategoryTimer](CategoryTimer)