Issue with NSDate - ios

Question

I am having a NSDate object in format as 2018-01-19 18:30:00 +0000. Now i want to change only the time components. After changing the time components the NSDate Object would be as 2018-01-19 10:00:00. I did tried various solution but nothing worked. If any one have any solution regarding this issue help out. Thank you in advance
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components: NSCalendarUnitYear| NSCalendarUnitMonth| NSCalendarUnitDay fromDate:date];
[components setHour:hour];
[components setMinute:minute];
[components setSecond:second];
NSDate *newDate = [calendar dateFromComponents:components];
another solution i tried is
NSDate *oldDate = date;
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDate];
comps.hour = 10;
comps.minute = 00;
comps.second = 00;
NSDate *newDate = [calendar dateFromComponents:comps];
Every time i get output is next date of input date

Answer 1

You can change the time components when you create a new NSDate object with:
NSDate *date = [calendar dateBySettingHour:10 minute:0 second:0 ofDate:[NSDate date] options:0];
Answer from: https://stackoverflow.com/a/5611700/4535184

Answer 2

Here is your code just add dateformater to formate the date
NSDate *oldDate = [[NSDate alloc]init];
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDate];
comps.hour = 10;
comps.minute = 00;
comps.second = 00;
NSDate *newDate = [calendar dateFromComponents:comps];
NSDateFormatter *formater = [[NSDateFormatter alloc]init];
formater.dateFormat = #"YYYY-MM-dd hh:mm:ss";
NSLog(#"New Date : %#",[formater stringFromDate:newDate]);

Answer 3

Try this
NSDateFormatter *formatter = [NSDateFormatter new];
[formatter setDateFormat:#"yyyy-MM-dd HH:mm:ss zzzz"];
NSDate *date = [formatter dateFromString:#"2018-01-19 18:30:00 +0000"];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components: NSCalendarUnitDay| NSCalendarUnitHour| NSCalendarUnitMinute|NSCalendarUnitDay|NSCalendarUnitMonth|NSCalendarUnitYear fromDate:date];
[components setHour:10];
[components setMinute:0];
[components setSecond:0];
NSDate *newDate = [calendar dateFromComponents:components];
[formatter setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSLog(#"%#",[formatter stringFromDate:newDate]);