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NSDate+KDUtilities.m
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NSDate+KDUtilities.m
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/*
Erica Sadun, http://ericasadun.com
iPhone Developer's Cookbook 3.x and beyond
BSD License, Use at your own risk
*/
/*
#import <humor.h> : Not planning to implement: dateByAskingBoyOut and dateByGettingBabysitter
----
General Thanks: sstreza, Scott Lawrence, Kevin Ballard, NoOneButMe, Avi`, August Joki. Emanuele Vulcano, jcromartiej
*/
/**
* This version of the file contains additions and changes made by
* Gianluca Tranchedone ( http://sketchtocode.com ).
* The author, Erica Sadun, is not responsible for those changes.
*/
#import "NSDate+KDUtilities.h"
@implementation NSDate (KDDateStyle)
- (NSString *)KD_stringByChineseRelativeFormatAllowFutureDate:(BOOL)allowFutureDate {
int minutes = [self timeIntervalSinceNow] / 60;
if (minutes < 0 || !allowFutureDate) {
minutes = - minutes;
if (minutes < 1) {
return @"刚才";
} else if (minutes < 60) {
return [NSString stringWithFormat:@"%d分钟前", minutes];
} else if (minutes < 60 * 24) {
return [NSString stringWithFormat:@"%d小时前", minutes / 60];
} else {
return [NSString stringWithFormat:@"%d天前", minutes / 60 / 24];
}
} else {
if (minutes < 1) {
return @"现在";
} else if (minutes < 60) {
return [NSString stringWithFormat:@"%d分钟后", minutes];
} else if (minutes < 60 * 24) {
return [NSString stringWithFormat:@"%d小时后", minutes / 60];
} else {
return [NSString stringWithFormat:@"%d天后", minutes / 60 / 24];
}
}
}
@end
#define D_MINUTE 60
#define D_HOUR 3600
#define D_DAY 86400
#define D_WEEK 604800
#define D_YEAR 31556926
#define DATE_COMPONENTS (NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | kCFCalendarUnitWeekOfYear | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday | NSCalendarUnitWeekdayOrdinal)
#define CURRENT_CALENDAR [NSCalendar currentCalendar]
@implementation NSDate (KDUtilities)
+ (BOOL)timeIs24HourFormat
{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[NSLocale currentLocale]];
[formatter setDateStyle:NSDateFormatterNoStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
NSString *dateString = [formatter stringFromDate:[NSDate date]];
NSRange amRange = [dateString rangeOfString:[formatter AMSymbol]];
NSRange pmRange = [dateString rangeOfString:[formatter PMSymbol]];
BOOL is24Hour = (amRange.location == NSNotFound && pmRange.location == NSNotFound);
return is24Hour;
}
#pragma mark Relative Dates
+ (NSDate *) dateWithDaysFromNow: (NSInteger) days
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_DAY * days;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
+ (NSDate *) dateWithDaysBeforeNow: (NSInteger) days
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] - D_DAY * days;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
+ (NSDate *) dateTomorrow
{
return [NSDate dateWithDaysFromNow:1];
}
+ (NSDate *) dateYesterday
{
return [NSDate dateWithDaysBeforeNow:1];
}
+ (NSDate *) dateWithHoursFromNow: (NSInteger) dHours
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_HOUR * dHours;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
+ (NSDate *) dateWithHoursBeforeNow: (NSInteger) dHours
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] - D_HOUR * dHours;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
+ (NSDate *) dateWithMinutesFromNow: (NSInteger) dMinutes
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_MINUTE * dMinutes;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
+ (NSDate *) dateWithMinutesBeforeNow: (NSInteger) dMinutes
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] - D_MINUTE * dMinutes;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
#pragma mark Comparing Dates
- (BOOL) isEqualToDateIgnoringTime: (NSDate *) aDate
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:aDate];
return (([components1 year] == [components2 year]) &&
([components1 month] == [components2 month]) &&
([components1 day] == [components2 day]));
}
- (BOOL) isToday
{
return [self isEqualToDateIgnoringTime:[NSDate date]];
}
- (BOOL) isTomorrow
{
return [self isEqualToDateIgnoringTime:[NSDate dateTomorrow]];
}
- (BOOL) isYesterday
{
return [self isEqualToDateIgnoringTime:[NSDate dateYesterday]];
}
// This hard codes the assumption that a week is 7 days
- (BOOL) isSameWeekAsDate: (NSDate *) aDate
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:aDate];
// Must be same week. 12/31 and 1/1 will both be week "1" if they are in the same week
if ([components1 weekOfYear] != [components2 weekOfYear]) return NO;
// Must have a time interval under 1 week. Thanks @aclark
return (fabs([self timeIntervalSinceDate:aDate]) < D_WEEK);
}
- (BOOL) isThisWeek
{
return [self isSameWeekAsDate:[NSDate date]];
}
- (BOOL) isNextWeek
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_WEEK;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return [self isSameYearAsDate:newDate];
}
- (BOOL) isLastWeek
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] - D_WEEK;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return [self isSameYearAsDate:newDate];
}
- (BOOL) isSameYearAsDate: (NSDate *) aDate
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:aDate];
return ([components1 year] == [components2 year]);
}
- (BOOL) isThisYear
{
return [self isSameWeekAsDate:[NSDate date]];
}
- (BOOL) isNextYear
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:[NSDate date]];
return ([components1 year] == ([components2 year] + 1));
}
- (BOOL) isLastYear
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:self];
NSDateComponents *components2 = [CURRENT_CALENDAR components:NSCalendarUnitYear fromDate:[NSDate date]];
return ([components1 year] == ([components2 year] - 1));
}
- (BOOL) isEarlierThanDate: (NSDate *) aDate
{
return ([self earlierDate:aDate] == self);
}
- (BOOL) isLaterThanDate: (NSDate *) aDate
{
return ([self laterDate:aDate] == self);
}
#pragma mark Adjusting Dates
- (NSDate *) dateByAddingDays: (NSInteger) dDays
{
NSTimeInterval aTimeInterval = [self timeIntervalSinceReferenceDate] + D_DAY * dDays;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
- (NSDate *) dateBySubtractingDays: (NSInteger) dDays
{
return [self dateByAddingDays: (dDays * -1)];
}
- (NSDate *) dateByAddingHours: (NSInteger) dHours
{
NSTimeInterval aTimeInterval = [self timeIntervalSinceReferenceDate] + D_HOUR * dHours;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
- (NSDate *) dateBySubtractingHours: (NSInteger) dHours
{
return [self dateByAddingHours: (dHours * -1)];
}
- (NSDate *) dateByAddingMinutes: (NSInteger) dMinutes
{
NSTimeInterval aTimeInterval = [self timeIntervalSinceReferenceDate] + D_MINUTE * dMinutes;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
return newDate;
}
- (NSDate *) dateBySubtractingMinutes: (NSInteger) dMinutes
{
return [self dateByAddingMinutes: (dMinutes * -1)];
}
- (NSDate *) dateAtStartOfDay
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
[components setHour:0];
[components setMinute:0];
[components setSecond:0];
return [CURRENT_CALENDAR dateFromComponents:components];
}
- (NSDate *) dateAtMiddleOfDay
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
[components setHour:12];
[components setMinute:0];
[components setSecond:0];
return [CURRENT_CALENDAR dateFromComponents:components];
}
- (NSDate *) dateAtStartOfMonth
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
[components setHour:0];
[components setMinute:0];
[components setSecond:0];
[components setDay:1];
return [CURRENT_CALENDAR dateFromComponents:components];
}
- (NSDateComponents *) componentsWithOffsetFromDate: (NSDate *) aDate
{
NSDateComponents *dTime = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:aDate toDate:self options:0];
return dTime;
}
#pragma mark Retrieving Intervals
- (NSInteger) minutesAfterDate: (NSDate *) aDate
{
NSTimeInterval ti = [self timeIntervalSinceDate:aDate];
return (NSInteger) (ti / D_MINUTE);
}
- (NSInteger) minutesBeforeDate: (NSDate *) aDate
{
NSTimeInterval ti = [aDate timeIntervalSinceDate:self];
return (NSInteger) (ti / D_MINUTE);
}
- (NSInteger) hoursAfterDate: (NSDate *) aDate
{
NSTimeInterval ti = [self timeIntervalSinceDate:aDate];
return (NSInteger) (ti / D_HOUR);
}
- (NSInteger) hoursBeforeDate: (NSDate *) aDate
{
NSTimeInterval ti = [aDate timeIntervalSinceDate:self];
return (NSInteger) (ti / D_HOUR);
}
- (NSInteger) daysAfterDate: (NSDate *) aDate
{
NSTimeInterval ti = [self timeIntervalSinceDate:aDate];
return (NSInteger) (ti / D_DAY);
}
- (NSInteger) daysBeforeDate: (NSDate *) aDate
{
NSTimeInterval ti = [aDate timeIntervalSinceDate:self];
return (NSInteger) (ti / D_DAY);
}
#pragma mark Decomposing Dates
- (NSInteger) nearestHour
{
NSTimeInterval aTimeInterval = [[NSDate date] timeIntervalSinceReferenceDate] + D_MINUTE * 30;
NSDate *newDate = [NSDate dateWithTimeIntervalSinceReferenceDate:aTimeInterval];
NSDateComponents *components = [CURRENT_CALENDAR components:NSCalendarUnitHour fromDate:newDate];
return [components hour];
}
- (NSInteger) hour
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components hour];
}
- (NSInteger) minute
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components minute];
}
- (NSInteger) seconds
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components second];
}
- (NSInteger) day
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components day];
}
- (NSInteger) month
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components month];
}
- (NSInteger) weekOfYear
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components weekOfYear];
}
- (NSInteger) weekday
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components weekday];
}
- (NSInteger) nthWeekday // e.g. 2nd Tuesday of the month is 2
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components weekdayOrdinal];
}
- (NSInteger) year
{
NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
return [components year];
}
@end