NSDate+Helper.h

//
//  NSDate+Helper.h
//  JZB
//
//  Created by Jin Jin on 11-4-15.
//  Copyright 2011年 __MyCompanyName__. All rights reserved.
//

#import <Foundation/Foundation.h>


@interface NSDate (NSDate_Helper)

//获取年月日如:19871127.

- (NSString *)getFormatYearMonthDay;
//返回当前月一共有几周(可能为4,5,6)

- (int )getWeekNumOfMonth;
//该日期是该年的第几周

- (int )getWeekOfYear;
//返回day天后的日期(若day为负数,则为|day|天前的日期)

- (NSDate *)dateAfterDay:(int)day;
//month个月后的日期

- (NSDate *)dateafterMonth:(int)month;
//获取日

- (NSUInteger)getDay;
//获取月

- (NSUInteger)getMonth;
//获取年

- (NSUInteger)getYear;
//获取小时

- (int )getHour ;
//获取分钟

- (int)getMinute ;
- (int )getHour:(NSDate *)date ;
- (int)getMinute:(NSDate *)date ;

//在当前日期前几天

- (NSUInteger)daysAgo ;
//午夜时间距今几天

- (NSUInteger)daysAgoAgainstMidnight ;
- (NSString *)stringDaysAgo ;
- (NSString *)stringDaysAgoAgainstMidnight:(BOOL)flag;
//返回一周的第几天(周末为第一天)

- (NSUInteger)weekday ;//转为NSString类型的

+ (NSDate *)dateFromString:(NSString *)string ;
+ (NSDate *)dateFromString:(NSString *)string withFormat:(NSString *)format ;
+ (NSString *)stringFromDate:(NSDate *)date withFormat:(NSString *)format ;
+ (NSString *)stringFromDate:(NSDate *)date ;
+ (NSString *)stringForDisplayFromDate:(NSDate *)date prefixed:(BOOL)prefixed ;
+ (NSString *)stringForDisplayFromDate:(NSDate *)date ;
- (NSString *)stringWithFormat:(NSString *)format;
- (NSString *)string ;
- (NSString *)stringWithDateStyle:(NSDateFormatterStyle)dateStyle timeStyle:(NSDateFormatterStyle)timeStyle;
//返回周日的的开始时间

- (NSDate *)beginningOfWeek;

//返回当前天的年月日.

- (NSDate *)beginningOfDay ;
//返回该月的第一天

- (NSDate *)beginningOfMonth;
//该月的最后一天

- (NSDate *)endOfMonth;
//返回当前周的周末
- (NSDate *)endOfWeek ;
//return RFC 822 timestamp
-(double)RFC822TimeInteral;

+ (NSString *)dateFormatString ;
+ (NSString *)timeFormatString ;
+ (NSString *)timestampFormatString ;
// preserving for compatibility

+ (NSString *)dbFormatString ;

@end