/*
* This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
*/
/*计算公历*/
void GregorianDay(struct rtc_time * tm)
{
int leapsToDate;
int lastYear;
int day;
int MonthOffset[] = { 0,31,59,90,120,151,181,212,243,273,304,334 };
lastYear=tm->tm_year-1;
/*计算从公元元年到计数的前一年之中一共经过了多少个闰年*/
leapsToDate = lastYear/4 - lastYear/100 + lastYear/400;
/*如果计数的这一年位闰年，且计数的月份在二月份之后，则日数加1，否则不加1*/
if((tm->tm_year%4==0) &&
((tm->tm_year%100!=0) || (tm->tm_year%400==0)) &&
(tm->tm_mon>2)) {
/*
* We are past Feb. 29 in a leap year
*/
day=1;
} else {
day=0;
}
day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] + tm->tm_mday; /*计算从公元元年元旦到计数日期一共有多少天*/
tm->tm_wday=day%7;
}
这个计算星期几到底怎么实现的啊？？ |
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