NSDate methods

NSDate+Additions

@interface NSDate (Additions)

-(int)numDaysInMonth;

-(int)firstWeekDayInMonth;

-(NSArray *)weeksOfMonth;

-(NSDate*)offsetDay:(int)days;

-(NSDate *)offsetMonth:(int)numMonths;

-(BOOL)isWeekend;

-(int)day;

-(int)month;

-(int)year;

-(int)quarter;

-(NSString*)weekdayName;

-(BOOL)isToday;

-(BOOL)isMonday;

@end



#import "NSDate+Additions.h"

@implementation NSDate (Additions)

-(int)numDaysInMonth {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSRange rng = [cal rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:self];
    NSUInteger numberOfDaysInMonth = rng.length;
    return numberOfDaysInMonth;
}

-(int)firstWeekDayInMonth {
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    [gregorian setFirstWeekday:2]; //monday is first day
    
    //Set date to first of month
    NSDateComponents *comps = [gregorian components:NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit fromDate:self];
    [comps setDay:1];
    NSDate *newDate = [gregorian dateFromComponents:comps];
    
    return [gregorian ordinalityOfUnit:NSWeekdayCalendarUnit inUnit:NSWeekCalendarUnit forDate:newDate];
}

-(NSDate *)offsetMonth:(int)numMonths {
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    [gregorian setFirstWeekday:2]; //monday is first day
    
    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
    [offsetComponents setMonth:numMonths];
    return [gregorian dateByAddingComponents:offsetComponents
                                      toDate:self options:0];
}

-(NSDate*)offsetDay:(int)days {
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
    [offsetComponents setDay:days];
    return [gregorian dateByAddingComponents:offsetComponents toDate:self options:0];
}

-(int)day {
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *components = [gregorian components:NSDayCalendarUnit fromDate:self];
    return [components day];
}

-(int)year {
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *components = [gregorian components:NSYearCalendarUnit fromDate:self];
    return [components year];
}


-(int)month {
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *components = [gregorian components:NSMonthCalendarUnit fromDate:self];
    return [components month];
}

-(int)quarter {
    /*
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *components = [gregorian components:NSQuarterCalendarUnit fromDate:self];
    return [components quarter];
     */
    
    NSDateFormatter *quarterOnly = [[VWKKCentralStorage sharedInstance] dateFormatter];//[[NSDateFormatter alloc]init];
    [quarterOnly setDateFormat:@"Q"];
    
    int quarter = [[quarterOnly stringFromDate:self] intValue];
    return quarter;
}


- (NSArray *)weeksOfMonth {
    
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    [calendar setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
    
    NSDateComponents *components = [[NSDateComponents alloc] init];
    [components setMonth:[self month]];
    [components setYear:[self year]];
    
    NSRange range = [calendar rangeOfUnit:NSDayCalendarUnit
                                   inUnit:NSMonthCalendarUnit
                                  forDate:[calendar dateFromComponents:components]];
    
    NSDateFormatter *dateFormatter = [[VWKKCentralStorage sharedInstance] dateFormatter];//[[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSMutableSet *weeks = [[NSMutableSet alloc] init ];
    
    for(int i = 0; i < range.length; i++)
    {
        NSString *temp = [NSString stringWithFormat:@"%4d-%2d-%2d", [self year], [self month], range.location+i];
        NSDate *date = [dateFormatter dateFromString:temp ];
        int week = [[calendar components: NSWeekOfYearCalendarUnit fromDate:date] weekOfYear];
        [weeks addObject:[NSNumber numberWithInt:week]];
    }
    
    NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];
    return [weeks sortedArrayUsingDescriptors:@[descriptor]];
}

-(BOOL)isWeekend {
    int dayOfWeek = [[[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:self] weekday];
    if (dayOfWeek == 7 || dayOfWeek == 1) {
        return YES;
    }
    
    return NO;
}

-(BOOL)isMonday {
    int dayOfWeek = [[[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:self] weekday];
    if (dayOfWeek == 2) {
        return YES;
    }
    
    return NO;
}

-(NSString*)weekdayName {
    NSDateFormatter *dateFormatter = [[VWKKCentralStorage sharedInstance] dateFormatter];//[[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"EEE"];
    [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:[NSLocale preferredLanguages][0] ] ];
    return [dateFormatter stringFromDate:self];
}

-(BOOL)isToday {
    NSDate *date = [NSDate date];
    
    if ([date day] == [self day] && [date month] == [self month] && [date year] == [self year] ) {
        return YES;
    }
    
    return NO;
}

@end