How to convert a DD-MM-YYYY date format string into a YYYY-MM-DD date format string or into a NSDate object in Objective-C? - objective-c

Question

I have read date from XML which give me back string where the date is like DD-MM-YYYY. But when I want to add it to my core data database, SQLite sorts me that wrong so I have to convert it to date format or to string like: YYYY-MM-DD. But SQLite does not support either Date() or To_Date() functions. Can you help me?

Answer 1

You can use NSDateFormatter to format a date in Objective C.
Here's a quick example which might not do exactly what you want, but should hopefully give some pointers:
// Convert my dd-mm-yyyyy string into a date object
NSString *stringDate = #"01-02-2011";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd-MM-yyyy"];
NSDate *date = [dateFormatter dateFromString:stringDate];
// Convert my date object into yyyy-mm-dd string object
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSString *formattedStringDate = [dateFormatter stringFromDate:date];
[dateFormatter release];
Hope this helps!
Nick.

Answer 2

Using Nick's tutorial and answer the solution is :
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd.MM.yyyy"];
NSDate *date = [dateFormatter dateFromString:#"01.02.1989"];
NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
// Convert my date object into yyyy-mm-dd string object
[dateFormatter1 setDateFormat:#"yyyy-MM-dd"];
NSString *formattedStringDate = [dateFormatter1 stringFromDate:date];
[dateFormatter release];
[dateFormatter1 release];
NSLog(formattedStringDate);
objektObrat.dateOfObrat = [[NSString alloc] initWithString:formattedStringDate];