Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_GetDayOfWeek - Get the day of week for a calendar date.
HEADER FILE
Defined in SDL3/SDL_time.h
SYNOPSIS
#include "SDL3/SDL.h" int SDL_GetDayOfWeek(int year, int month, int day);
FUNCTION PARAMETERS
year the year component of the date. month the month component of the date. day the day component of the date.
RETURN VALUE
Returns a value between 0 and 6 (0 being Sunday) if the date is valid or -1 on failure; call SDL_GetError () for more information.
AVAILABILITY
This function is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.8 SDL_GetDayOfWeek(3)