gistfile1.m

    NSDate *fireDate = nil;
    
    NSDate *startDate = [card getLatestDateOfActivities:@[ACTIVITY_CARD_CREATED, ACTIVITY_TIME_SET, ACTIVITY_TIME_CHANGED]];
    NSDate *endDate = card.time.date;
    
    NSTimeInterval deltaHours = (abs([startDate timeIntervalSinceReferenceDate] - [endDate timeIntervalSinceReferenceDate]) / 3600);
    
    NSString *invitesNamesSentence = [card getInvitesNamesSentenceWithYourFriendsOption:YES];
    NSMutableString *alertBody = [[NSMutableString alloc] initWithFormat:@"%@ wants to meet you ", invitesNamesSentence];
    
    if (endDate && deltaHours < 24)
    {
        fireDate = [startDate dateByAddingMinutes:30];
        
        [alertBody appendFormat:@"%@. Don't wait and respond on card %@.", [card.time getUniversalTimeDateString], card.category.name];
    }
    else
    {
        fireDate = [startDate dateByAddingHours:5];
        
        [alertBody appendFormat:@"for %@", card.category.name];
        
        if (endDate)
        {
            [alertBody appendFormat:@", %@", [card.time getUniversalTimeDateString]];
        }
        
        if (card.location)
        {
            [alertBody appendFormat:@" at %@ and is still waiting for you to respond.", card.location.name];
        }
        else
        {
            [alertBody appendFormat:@". Don’t wait, respond right away."];
        }
    }