NSCalendar的操作

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NSCalendar *currentCalender = [NSCalendar currentCalendar];        NSDateComponents *components = [[NSDateComponents alloc]init];        components.year = 2015;        components.month = 12;        components.day = 17;        components.hour = 22;        components.minute = 46;        components.second = 30;                NSDate *datee = [currentCalender dateFromComponents:components];        NSLog(@"datee=%@",datee);        //如何将NSdate 转换成NSString?  NSDateFormatter默认转换为本地时间        NSDateFormatter *dateFormatter = [NSDateFormatter new];        //设置时区        dateFormatter.timeZone = [NSTimeZone systemTimeZone];        //设置输出格式        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];        NSString *string = [dateFormatter stringFromDate:[NSDate date]];        NSLog(@"string = %@",string);                //将时间类型的字符串转化为日期         NSString *string1 = @"1970-01-01 08:00:00";                [dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];        //这里得到的时间是GMT时间        NSDate *date8 =  [dateFormatter dateFromString:string1];        NSLog(@"date8 = %@",date8);                        NSTimeInterval Interval =  date8.timeIntervalSinceNow;        NSLog(@"距今已经%f秒了",Interval);                Interval = -Interval / 60;        NSLog(@"%f",Interval);//求出分                NSLog(@"%f",[[NSDate date] timeIntervalSince1970]);//距离1970有多少秒
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