NSDate

    //获取当前年月日和星期

    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];

    NSDate *date = [NSDate date];

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

    NSInteger unitFlags = NSCalendarUnitYear |

    NSCalendarUnitMonth |

    NSCalendarUnitDay |

    NSCalendarUnitWeekday |

    NSCalendarUnitHour |

    NSCalendarUnitMinute |

    NSCalendarUnitSecond;

    NSDateComponents *comps = [calendar components:unitFlags fromDate:date];

    NSInteger week = [comps weekday];

    NSInteger year=[comps year];

    NSInteger month = [comps month];

    NSInteger day = [comps day];

    NSString *dataStr = [NSString stringWithFormat:@"%ld年%ld月%ld日(%@)",(long)year,(long)month,(long)day,arrWeek[week-1]];

//获取下个月的今天的Date

    NSDate *currentDate = [NSDate date];//获取当前时间，日期

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

    NSDateComponents *comps = [[NSDateComponents alloc] init];

    NSInteger unitFlags = NSCalendarUnitYear |

    NSCalendarUnitMonth |

    NSCalendarUnitDay;

    comps = [calendarnow components:unitFlags fromDate:currentDate];

    NSDateComponents *adcomps = [[NSDateComponents alloc] init];

    [adcomps setYear:0];

    [adcomps setMonth:+1];

    [adcomps setDay:0];

    NSDate *newdate = [calendarnow dateByAddingComponents:adcomps toDate:currentDate options:0];

//获取年月日

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

    [formatter setDateFormat:@"yyyy"];//设置显示的日期

    NSString *currentyearString = [NSString stringWithFormat:@"%@",[formatter stringFromDate:currentDate]];

    // Get Current  Month

    [formatter setDateFormat:@"MM"];

    NSString *currentMonthString = [NSString stringWithFormat:@"%@",[formatter stringFromDate:currentDate]];

//求两个时间的间隔

 NSInteger second = [strDate timeIntervalSinceDate:currentDate];

NSDate

原文：http://www.cnblogs.com/lizongkai/p/5161345.html