NSDate中分别分离提取出年月日分时秒的方法
NSDate *now = [NSDate date];
NSCalendar *cal = [NSCalendar currentCalendar];
unsigned int unitFlags = NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *dd = [cal components:unitFlags fromDate:now];
int week = [dd weekday];
int hour = [dd hour];
int minute = [dd minute];
second = [dd second];
That is it！NSDate *now = [NSDate date];
NSCalendar *cal = [NSCalendar currentCalendar];
unsigned int unitFlags = NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *dd = [cal components:unitFlags fromDate:now];
int week = [dd weekday];
int hour = [dd hour];
int minute = [dd minute];
second = [dd second];
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