Get the number of milliseconds since SDL library initialization.
Returns an unsigned 32-bit value representing the number of milliseconds since the SDL library initialized.
This value wraps if the program runs for more than ~49 days.
This function is not recommended as of SDL 2.0.18; use SDL_GetTicks64() instead, where the value doesn't wrap every ~49 days. There are places in SDL where we provide a 32-bit timestamp that can not change without breaking binary compatibility, though, so this function isn't officially deprecated.
This function is available since SDL 2.0.0.