How to change year in date to current year? - iphone

Question

i have one array something like below
Birthdates(
"03/12/2013",
"03/12/2013",
"08/13/1990",
"12/09/1989",
"02/06",
"09/08",
"03/02/1990",
"08/22/1989",
"03/02",
"05/13",
"10/16",
"07/08",
"08/31/1990",
"04/14/1992",
"12/15/1905",
"08/14/1989",
"10/07/1987",
"07/25",
"07/17/1989",
"03/24/1987",
"07/28/1988",
"01/21/1990",
"10/13"
)
all are NSString
now i want to make another array from this in which all years should be 2013 if that date is coming in current year and if date is already passed then change year to 2014?
in above sentence we are not considering year we consider only day and month and then see in current year is it already passed or not?
example if date is "12/15/1905" then convert it in another array like "12/15/2013"
but if date is like "01/01/1990" then convert it in another array like "01/01/2014"
bcoz it has already passed current date
plz help thank you in advance :)
i will prefer to do something in which code apply for not only 2013 and 2014 it should apply for coming future too.

Answer 1

This code will do for you :
NSArray *Birthdates=#[
#"03/12/2013",
#"03/12/2013",
#"08/13/1990",
#"12/09/1989",
#"02/02",
#"09/08",
#"03/02/1990",
#"08/22/1989",
#"03/02"];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSYearCalendarUnit fromDate:[NSDate date]];
NSInteger currentYear = [components year];
NSMutableArray *newBirthDates=[NSMutableArray new];
for(NSString *str in Birthdates){
NSArray *array=[str componentsSeparatedByString:#"/"];
if(array.count==2){
NSString *tempString=[NSString stringWithFormat:#"%#/%d",str,currentYear];
NSDateFormatter *dateFormatter=[NSDateFormatter new];
[dateFormatter setDateFormat:#"MM/dd/yyyy"];
NSDate *date=[dateFormatter dateFromString:tempString];
if ([[NSDate date] isGreaterThanOrEqualTo:date]) {
NSLog(#"passed->%# *** %#",date, str);
[newBirthDates addObject:[NSString stringWithFormat:#"%#/%d",str,currentYear+1]];
}
[newBirthDates addObject:tempString];
}
else{
NSString *dateString=[NSString stringWithFormat:#"%#/%#/%d",array[0],array[1],currentYear];
NSDateFormatter *dateFormatter=[NSDateFormatter new];
[dateFormatter setDateFormat:#"MM/dd/yyyy"];
NSDate *date=[dateFormatter dateFromString:dateString];
if ([[NSDate date] isGreaterThanOrEqualTo:date]) {
dateString=[NSString stringWithFormat:#"%#/%#/%d",array[0],array[1],currentYear+1];
}
[newBirthDates addObject:dateString];
}
}
NSLog(#"%#",newBirthDates);
Here is the Output:
DocumentBased[6632:303] (
"03/12/2014",
"03/12/2014",
"08/13/2013",
"12/09/2013",
"02/02/2014",
"09/08/2013",
"03/02/2014",
"08/22/2013",
"03/02/2014"
)

Answer 2

This code is same as Anoop Vaidya code upto fetching all the dateStrings into one format. but the date comparision logic which fails in Anoop code is over comed here i.e., when count == 2..
Here is my edited code respect to Anoop
NSArray *Birthdates=#[
#"03/12/2013",
#"03/12/2013",
#"08/13/1990",
#"12/09/1989",
#"02/06",
#"09/08",
#"03/02/1990",
#"08/22/1989",
#"03/02"];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy"];
NSString *curYear = [dateFormatter stringFromDate:[NSDate date]];
NSString *nextYear = [NSString stringWithFormat: #"%d", ([curYear intValue] + 1)];
[dateFormatter setDateFormat:#"MM/dd/yyyy"];
NSMutableArray *newBirthDates=[NSMutableArray new];
for(NSString *str in Birthdates){
NSArray *array=[str componentsSeparatedByString:#"/"];
if(array.count==2){
[newBirthDates addObject:[NSString stringWithFormat:#"%#/%#",str,curYear]];
}
else{
[newBirthDates addObject:[NSString stringWithFormat:#"%#/%#/%#",array[0],array[1],curYear]];
}
}
for(int i = 0; i < [newBirthDates count]; i++)
{
NSString *dateStr = [newBirthDates objectAtIndex:i];
NSComparisonResult comResult = [[dateFormatter dateFromString:dateStr] compare:[NSDate date]];
if(comResult == NSOrderedAscending)
{
[dateStr stringByReplacingOccurrencesOfString:curYear withString:nextYear];
[newBirthDates replaceObjectAtIndex:i withObject:dateStr];
}
}
NSLog(#"%#",newBirthDates);
This will work in all the scenarios...

Answer 3

I take it you know how to use the NSDateFormatter to format dates, to change the year alone, just check this link NSDateComponents. Please have a look at this StackOverflow question on how to split the date into NSDateComponents.

Answer 4

I think You can check it directly without using dateFormatter.
Steps to do:
First find the current date with NSDate.Convert it into string and make the format as same the array you have, by using NSDateFormatter.
Next compare one by one by making condition .
Separate the string by "/" .
if([myArray objectAtIndex:i]string separate by#"/" objectAtIndex:0 )
and the check the next one ...
Make the condition as you want
I hope if you do like this with less lines of code you can achieve what you want.