獲取當前年月日和周幾

+(NSString*)getNowYear{

       NSCalendar *calendar = [NSCalendarcurrentCalendar];

        //2.獲取當前年份2018

        unsigned unitFlags =NSCalendarUnitYear |NSCalendarUnitMonth |NSCalendarUnitDay;

        NSDateComponents *components = [calendarcomponents:unitFlags fromDate:[NSDate date]];

        NSLog(@"%ld, %ld, %ld", (long)components.year, (long)components.month, (long)components.day);

    return [NSStringstringWithFormat:@"%ld",(long)components.year];

}

+(NSString*)getNowMouth{

    NSCalendar *calendar = [NSCalendarcurrentCalendar];

    //2.獲取當前月份05

    unsigned unitFlags =NSCalendarUnitYear |NSCalendarUnitMonth |NSCalendarUnitDay;

    NSDateComponents *components = [calendar components:unitFlags fromDate:[NSDatedate]];

    NSLog(@"%ld, %ld, %ld", (long)components.year, (long)components.month, (long)components.day);

    return [NSStringstringWithFormat:@"%02ld",(long)components.month];

}

+(NSString*)getNowDay{

    NSCalendar *calendar = [NSCalendarcurrentCalendar];

    //2.獲取當前號數09

    unsigned unitFlags =NSCalendarUnitYear |NSCalendarUnitMonth |NSCalendarUnitDay;

    NSDateComponents *components = [calendar components:unitFlags fromDate:[NSDatedate]];

    return [NSStringstringWithFormat:@"%02ld",(long)components.day];

}

+(NSString *)getZhouJiNow{

    //3.獲取當前日期星期幾

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    //在這裏需要注意的是：星期日是數字1，星期一時數字2，以此類推。。。

    NSArray *weekdays = [NSArray arrayWithObjects:[NSNull null],@"週日", @"週一", @"週二", @"週三", @"週四", @"週五", @"週六", nil];

    NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];

    [calendar setTimeZone: timeZone];

    NSDate *date = [NSDate date];

    NSCalendarUnit calendarUnit = NSCalendarUnitWeekday;

    NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:date];

    return [weekdays objectAtIndex:theComponents.weekday];

}