Can't fire UILocalNotification on custom time ios objective c

Question

I want to fire NSLocalNotification on my custom time. Ex. 1hour before appointment time but unable to set it on my custom time.

NSDate *dt1 = [NSDate date]; //2018-07-18 10:41:22 +0000

NSString *datestr = [NSString stringWithFormat:@"%@", [NSDate date]];//2018-07-18 10:42:09 +0000

NSRange range = NSMakeRange(11,5);

NSString *cutstring = 05:00 PM;

By this I add substring to current date and change date in my custom date.

NSString *newstr = [cutstring substringWithRange:NSMakeRange(0, 5)];

NSString *changed = [datestr stringByReplacingCharactersInRange:range withString:newstr]; //2018-07-18 05:00:09 +0000

By this code I got my custom time '2018-07-18 05:00:09 +0000' on which I want to fire UILocalNotification, But issue is that when I set my custom time with NSLocalNotification it set's on such a random time like 18 July 2018 at 4:19:29 PM

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss ZZZ"];
    NSDate *fireddate = [dateFormatter dateFromString:changed];
    localNotification.fireDate = fireddate;
    NSLog(@"%@",fireddate);
    localNotification.alertBody = [NSString stringWithFormat:@"You have appointment in 1 hour"];
    localNotification.soundName = UILocalNotificationDefaultSoundName;
    localNotification.applicationIconBadgeNumber = 1;
    localNotification.category = @"ACTIONABLE";

---

 //Received Local Notification:<UIConcreteLocalNotification:
 0x6000003887b0>{fire date = Wednesday, 18 July 2018 at 4:19:29 PM
 India Standard Time, time zone = (null), repeat interval = 0, repeat
 count = UILocalNotificationInfiniteRepeatCount, next fire date =
 (null), user info = { }}

Answer 1

I would just create a fire date with NSDateComponents where you can set year , month , hour , minute etc.

Something like this:

NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
dateComponents.calendar = [NSCalendar currentCalendar];
[dateComponents setYear:year];
[dateComponents setMonth:month];
[dateComponents setDay:day];
[dateComponents setHour:hour];

NSDate *fireDate = [dateComponents date];

You can read more about it in this great article

NSDate​Components - NSHipster