NSDateFormatter dateFromString与日期

Question

i have a problem with method dateFromString, here is my code

NSString* res = [NSString stringWithFormat:@"%@/%@/%@",dateInput.text,monthInput.text,yearInput.text];
NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
[formatter setTimeZone:[NSTimeZone localTimeZone]];
[formatter setDateFormat:@"dd/MM/yy"];
NSDate* inpTime = [formatter dateFromString:res];
[dateResult setText:[NSString stringWithFormat:@"%@",inpTime]];

when I run, the date in "inpTime" always is "dateInput" - 1. for example: if "dateInput" is 5, the date in "inpTime" will be 4

Answer 1

You need to adjust the timezone.

Change

[formatter setTimeZone:[NSTimeZone localTimeZone]];

to

[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];

This is because you're not setting the time, so it's set by default the midnight UTC. But when you are displaying the date with a timezone other than UTC the time is shifted accordingly.

As an example if you live in New York the 12/29/2012 00:00:00 UTC is actually the 12/28/2012 18:00:00 for you.

Answer 2

You Code is perfect, no error what so ever.

Try nslogging dateInput.text, monthInput.text and yearInput.text...might be from here you are getting invalid data.