/*
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Erica Sadun, http://ericasadun.com
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iPhone Developer's Cookbook 3.x and beyond
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BSD License, Use at your own risk
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*/
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#import <Foundation/Foundation.h>
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#define D_MINUTE 60
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#define D_HOUR 3600
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#define D_DAY 86400
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#define D_WEEK 604800
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#define D_YEAR 31556926
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@interface NSDate (Utilities)
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// Relative dates from the current date
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+ (NSDate *) dateTomorrow;
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+ (NSDate *) dateYesterday;
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+ (NSDate *) dateWithDaysFromNow: (NSInteger) days;
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+ (NSDate *) dateWithDaysBeforeNow: (NSInteger) days;
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+ (NSDate *) dateWithHoursFromNow: (NSInteger) dHours;
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+ (NSDate *) dateWithHoursBeforeNow: (NSInteger) dHours;
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+ (NSDate *) dateWithMinutesFromNow: (NSInteger) dMinutes;
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+ (NSDate *) dateWithMinutesBeforeNow: (NSInteger) dMinutes;
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// Comparing dates
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- (BOOL) isEqualToDateIgnoringTime: (NSDate *) aDate;
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- (BOOL) isToday;
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- (BOOL) isTomorrow;
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- (BOOL) isYesterday;
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- (BOOL) isSameWeekAsDate: (NSDate *) aDate;
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- (BOOL) isThisWeek;
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- (BOOL) isNextWeek;
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- (BOOL) isLastWeek;
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- (BOOL) isSameMonthAsDate: (NSDate *) aDate;
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- (BOOL) isThisMonth;
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- (BOOL) isSameYearAsDate: (NSDate *) aDate;
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- (BOOL) isThisYear;
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- (BOOL) isNextYear;
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- (BOOL) isLastYear;
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- (BOOL) isEarlierThanDate: (NSDate *) aDate;
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- (BOOL) isLaterThanDate: (NSDate *) aDate;
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// Date roles
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- (BOOL) isTypicallyWorkday;
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- (BOOL) isTypicallyWeekend;
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// Adjusting dates
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- (NSDate *) dateByAddingDays: (NSInteger) dDays;
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- (NSDate *) dateBySubtractingDays: (NSInteger) dDays;
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- (NSDate *) dateByAddingHours: (NSInteger) dHours;
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- (NSDate *) dateBySubtractingHours: (NSInteger) dHours;
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- (NSDate *) dateByAddingMinutes: (NSInteger) dMinutes;
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- (NSDate *) dateBySubtractingMinutes: (NSInteger) dMinutes;
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- (NSDate *) dateAtStartOfDay;
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// Retrieving intervals
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- (NSInteger) minutesAfterDate: (NSDate *) aDate;
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- (NSInteger) minutesBeforeDate: (NSDate *) aDate;
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- (NSInteger) hoursAfterDate: (NSDate *) aDate;
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- (NSInteger) hoursBeforeDate: (NSDate *) aDate;
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- (NSInteger) daysAfterDate: (NSDate *) aDate;
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- (NSInteger) daysBeforeDate: (NSDate *) aDate;
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// Decomposing dates
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@property (readonly) NSInteger nearestHour;
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@property (readonly) NSInteger hour;
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@property (readonly) NSInteger minute;
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@property (readonly) NSInteger seconds;
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@property (readonly) NSInteger day;
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@property (readonly) NSInteger month;
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@property (readonly) NSInteger week;
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@property (readonly) NSInteger weekday;
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@property (readonly) NSInteger nthWeekday; // e.g. 2nd Tuesday of the month == 2
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@property (readonly) NSInteger year;
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@end
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