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resettodr — set battery-backed clock from system time
#include <sys/types.h> #include <sys/systm.h> void resettodr(void);
The resettodr() function sets the system's battery-backed clock based on the contents of the system time variable.
On many systems, resettodr() has to convert from time to a time expressed in terms of year, month, day, hours, minutes, and seconds. Many of the implementations could share code, but do not.