text: /************************************************************
   *  * Hyphenate CONFIDENTIAL
   * __________________
   * Copyright (C) 2016 Hyphenate Inc. All rights reserved.
   *
   * NOTICE: All information contained herein is, and remains
   * the property of Hyphenate Inc.
   * Dissemination of this information or reproduction of this material
   * is strictly forbidden unless prior written permission is obtained
   * from Hyphenate Inc.
   */
  
  #import <Foundation/Foundation.h>
  
  #define D_MINUTE	60
  #define D_HOUR		3600
  #define D_DAY		86400
  #define D_WEEK		604800
  #define D_YEAR		31556926
  
  @interface NSDate (Category)
  
  - (NSString *)timeIntervalDescription;//距离当前的时间间隔描述
  - (NSString *)minuteDescription;/*精确到分钟的日期描述*/
  - (NSString *)formattedTime;
  - (NSString *)formattedDateDescription;//格式化日期描述
  - (double)timeIntervalSince1970InMilliSecond;
  + (NSDate *)dateWithTimeIntervalInMilliSecondSince1970:(double)timeIntervalInMilliSecond;
  + (NSString *)formattedTimeFromTimeInterval:(long long)time;
  // Relative dates from the current date
  + (NSDate *) dateTomorrow;
  + (NSDate *) dateYesterday;
  + (NSDate *) dateWithDaysFromNow: (NSInteger) days;
  + (NSDate *) dateWithDaysBeforeNow: (NSInteger) days;
  + (NSDate *) dateWithHoursFromNow: (NSInteger) dHours;
  + (NSDate *) dateWithHoursBeforeNow: (NSInteger) dHours;
  + (NSDate *) dateWithMinutesFromNow: (NSInteger) dMinutes;
  + (NSDate *) dateWithMinutesBeforeNow: (NSInteger) dMinutes;
  
  // Comparing dates
  - (BOOL) isEqualToDateIgnoringTime: (NSDate *) aDate;
  - (BOOL) isToday;
  - (BOOL) isTomorrow;
  - (BOOL) isYesterday;
  - (BOOL) isSameWeekAsDate: (NSDate *) aDate;
  - (BOOL) isThisWeek;
  - (BOOL) isNextWeek;
  - (BOOL) isLastWeek;
  - (BOOL) isSameMonthAsDate: (NSDate *) aDate;
  - (BOOL) isThisMonth;
  - (BOOL) isSameYearAsDate: (NSDate *) aDate;
  - (BOOL) isThisYear;
  - (BOOL) isNextYear;
  - (BOOL) isLastYear;
  - (BOOL) isEarlierThanDate: (NSDate *) aDate;
  - (BOOL) isLaterThanDate: (NSDate *) aDate;
  - (BOOL) isInFuture;
  - (BOOL) isInPast;
  
  // Date roles
  - (BOOL) isTypicallyWorkday;
  - (BOOL) isTypicallyWeekend;
  
  // Adjusting dates
  - (NSDate *) dateByAddingDays: (NSInteger) dDays;
  - (NSDate *) dateBySubtractingDays: (NSInteger) dDays;
  - (NSDate *) dateByAddingHours: (NSInteger) dHours;
  - (NSDate *) dateBySubtractingHours: (NSInteger) dHours;
  - (NSDate *) dateByAddingMinutes: (NSInteger) dMinutes;
  - (NSDate *) dateBySubtractingMinutes: (NSInteger) dMinutes;
  - (NSDate *) dateAtStartOfDay;
  
  // Retrieving intervals
  - (NSInteger) minutesAfterDate: (NSDate *) aDate;
  - (NSInteger) minutesBeforeDate: (NSDate *) aDate;
  - (NSInteger) hoursAfterDate: (NSDate *) aDate;
  - (NSInteger) hoursBeforeDate: (NSDate *) aDate;
  - (NSInteger) daysAfterDate: (NSDate *) aDate;
  - (NSInteger) daysBeforeDate: (NSDate *) aDate;
  - (NSInteger)distanceInDaysToDate:(NSDate *)anotherDate;
  
  // Decomposing dates
  @property (readonly) NSInteger nearestHour;
  @property (readonly) NSInteger hour;
  @property (readonly) NSInteger minute;
  @property (readonly) NSInteger seconds;
  @property (readonly) NSInteger day;
  @property (readonly) NSInteger month;
  @property (readonly) NSInteger week;
  @property (readonly) NSInteger weekday;
  @property (readonly) NSInteger nthWeekday; // e.g. 2nd Tuesday of the month == 2
  @property (readonly) NSInteger year;
  
  @end
  