oc之获取系统当前时间的方法

int main(int argc, const char * argv[]) {

@autoreleasepool {

NSDate* date = [NSDate date];

NSLog(@"%@",date);

NSLog(@"%@",[date descriptionWithLocale:[NSLocale currentLocale]]);

//NSDate和NSString转换

NSDateFormatter* formattor = [[NSDateFormatter alloc]init];

formattor.dateFormat=@"yyyy-MM-dd hh:mm:ss";

NSString* str = [formattor stringFromDate:date];

NSLog(@"%@",str);

//获取年月日

NSCalendarDate* calender = [NSCalendarDate calendarDate];

NSInteger year = [calender yearOfCommonEra];

NSLog(@"%ld",year);

}

return 0;

}