RE of some coreinit functions

coreinit.c

#include <wut.h>

/* 32 bit unix time_t */
typedef uint32_t time32_t;

/* coreinit: convert COS time to POSIX time */
time32_t __OSCalendarTimeToPOSIXTime(OSCalendarTime *td)
{
	/* compute number of days to epoch */
	uint32_t epoch_days = (1970 * 365) + GetLeapDays(1970);

	/* compute number of days to this year */
	uint32_t days = (td->tm_year * 365) + GetLeapDays(td->tm_year);
	days += GetYearDays(td->tm_year, td->tm_mon);
	days += td->tm_mday - 1;

	/* compute posix time */
	time32_t unix_time = (days - epoch_days) * 86400;
	unix_time += td->tm_hour * 3600;
	unix_time += td->tm_min * 60;
	unix_time += td->tm_sec;

	return unix_time;
}