iOS获取当前日期（时分秒年月日星期）

- (NSString *)getWeek
{
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *comps = [[NSDateComponents alloc] init];
    NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday |
    NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
    
    comps = [calendar components:unitFlags fromDate:[NSDate date]];
    NSInteger year=[comps year];
    NSInteger week = [comps weekday];
    NSInteger month = [comps month];
    NSInteger day = [comps day];
    NSInteger hour = [comps hour];
    NSInteger min = [comps minute];
    NSInteger sec = [comps second];

    NSArray * arrWeek=[NSArray arrayWithObjects:@"星期日",@"星期一",@"星期二",@"星期三",@"星期四",@"星期五",@"星期六", nil];

//    NSLog(@"星期:%@", [NSString stringWithFormat:@"%@",[arrWeek objectAtIndex:[comps weekday] - 1]]);
    return [NSString stringWithFormat:@"%@",[arrWeek objectAtIndex:[comps weekday] - 1]];
}