filterdates.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSArray *dates = @[
                           [[NSCalendar currentCalendar] dateFromComponents:({
                               NSDateComponents *c = [[NSDateComponents alloc] init];
                               c.year = 2010;
                               c.month = 12;
                               c.day = 9;
                               c.hour = 12;
                               c.minute = 30;
                               c;
                           })],
                           [[NSCalendar currentCalendar] dateFromComponents:({
                               NSDateComponents *c = [[NSDateComponents alloc] init];
                               c.year = 2014;
                               c.month = 10;
                               c.day = 23;
                               c.hour = 12;
                               c.minute = 30;
                               c;
                           })],
                           [[NSCalendar currentCalendar] dateFromComponents:({
                               NSDateComponents *c = [[NSDateComponents alloc] init];
                               c.year = 2014;
                               c.month = 10;
                               c.day = 23;
                               c.hour = 1;
                               c.minute = 30;
                               c;
                           })],
                           [[NSCalendar currentCalendar] dateFromComponents:({
                               NSDateComponents *c = [[NSDateComponents alloc] init];
                               c.year = 2014;
                               c.month = 10;
                               c.day = 30;
                               c.hour = 12;
                               c.minute = 30;
                               c;
                           })],
                           [[NSCalendar currentCalendar] dateFromComponents:({
                               NSDateComponents *c = [[NSDateComponents alloc] init];
                               c.year = 2014;
                               c.month = 10;
                               c.day = 24;
                               c.hour = 12;
                               c.minute = 30;
                               c;
                           })],
                           [[NSCalendar currentCalendar] dateFromComponents:({
                               NSDateComponents *c = [[NSDateComponents alloc] init];
                               c.year = 2014;
                               c.month = 10;
                               c.day = 24;
                               c.hour = 5;
                               c.minute = 0;
                               c;
                           })],
                           ];
        
        NSDate *now = [NSDate date];
        NSDate *mondayThisWeek;
        NSDate *mondayNextWeek;
        NSTimeInterval lengthOfWeek;
        
        [[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitDay startDate:&mondayThisWeek interval:&lengthOfWeek forDate:now];
        mondayNextWeek = [mondayThisWeek dateByAddingTimeInterval:lengthOfWeek];
        
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(SELF >= %@) AND (SELF < %@)", mondayThisWeek, mondayNextWeek];
        
        NSArray *filteredDates = [dates filteredArrayUsingPredicate:predicate];
        
        NSIndexSet *dateIndicies = [filteredDates indexesOfObjectsPassingTest:^BOOL(NSDate *date, NSUInteger idx, BOOL *stop) {
            NSDate *rangeStart;
            NSDate *rangeEnd;
            NSTimeInterval lenghtOfDay;
            
            [[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitDay startDate:&rangeStart   interval:&lenghtOfDay forDate:now];
            rangeEnd = [[NSCalendar currentCalendar] dateByAddingComponents:({
                NSDateComponents *c = [[NSDateComponents alloc] init];
                c.hour = 20;
                c.minute = 0;
                c;
            }) toDate:rangeStart options:0];
            
            rangeStart = [[NSCalendar  currentCalendar] dateByAddingComponents:({
                NSDateComponents *c = [[NSDateComponents alloc] init];
                c.hour = 7;
                c.minute = 30;
                c;
            }) toDate:rangeStart options:0];
            return  ([rangeStart timeIntervalSince1970] < [date timeIntervalSince1970] && [date timeIntervalSince1970]  < [rangeEnd timeIntervalSince1970]);
            
        }];
        
        filteredDates = [filteredDates objectsAtIndexes:dateIndicies];
        
    }
    return 0;
}