I have the following code:
NSDateFormatter *dateFormater = [[NSDateFormatter alloc] init];
[dateFormater setDateFormat:#"yyyy-MM-DD HH:mm:ss"];
[dateFormater setLocale:[NSLocale currentLocale]];
[dateFormater setTimeZone:[NSTimeZone systemTimeZone]];
NSDate *localDate = [dateFormater dateFromString:localUpdate];
NSDate *serverDate = [dateFormater dateFromString:serverUpdate];
The input strings for localUpdate and serverUpdate are:
2014-01-31 23:42:17
2014-02-01 00:09:37
When converting those from NSString to NSDate, the second one is 2 months behind?
2014-01-31 22:42:17 +0000
2013-12-31 23:09:37 +0000
Can anyone explain this?
check this line:
[dateFormater setDateFormat:#"yyyy-MM-DD HH:mm:ss"];
the correct date format is #"yyyy-MM-dd HH:mm:ss" with "dd" not "DD"
I had the same problem once... and if the date format it's incorrect, when you use the dateFormatter, it will subtract or add one month to the date.
Your date format string "yyyy-MM-DD HH:mm:ss" is not quite right.
You're telling NSDateFormatter to parse the 01 in your second example as the day of the year (DD) instead of the day of the month (dd), which you want instead.
yyyy-MM-DD HH:mm:ss
2014-02-01 00:09:37
^^~~~~~~~~~~~ these digits are being parsed as day of year rather
than as day of month
This is an easy mistake, and one that is confusingly hidden by your first example, in which the day of month and the day of year are the same.
See the Unicode reference for the date formats used by iOS 6 and up. (For older versions, choose the right link in Apple's documentation.)
Academic tangent: why NSDateFormatter interprets the second date as being on the last day of 2013 (rather than 1st day of 2014, as specified) is probably a bug caused by specifying a month and a day of year (which are mutually exclusive), a bug in the parser (interpreting the -01th day of the year), or a timezone or daylight savings detail (if the rules changed on midnight in the local timezone.)
Related
I have searched over internet for a long time to get this but I can't find the solution. I have received a date string from web services as "22 May 2014", I have to convert into NSDate format for check it with current date. And I have to find out the date from web service is in future or in past time.
The actual problem is that when I convert this using
NSDate *date;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd MMMM YYYY"];
date = [dateFormatter dateFromString:dateString];
But I get an entirely Different Date, Sample Input dateString:22 June 2014 and Output I get is 2013-12-21 18:30:00+0000
Please suggest any solutions.
Thanks in advance. :)
You're using YYYY, which doesn't mean what you think it means. From the TR35-31 documentation, Y is the symbol for "year in week-of-year calendars".
You want dd MMMM yyyy instead as your format string. Mixing week-of-year-based fields and regular day/month/year fields is a recipe for odd problems.
Additionally, you may well want to set the time zone in your formatter - if you're just parsing a date, then you should consider using UTC, and make sure that all your calculations and formatting/parsing use UTC.
(I suspect the issue here is that week-of-year hasn't been set, so is assumed to be 1... and the week-year 2014 started on December 30th. Then the day-of-month is set to 22 by the dd part, and then your time zone offset of UTC+05:30 is taken into account.)
Maybe it's an old question and I've searched on this site and found some similar questions, but I still cannot solve my problem. I have a NSString named gameDateTimeStr: "11/12/2013-10:00 PM" and I want to convert it to NSDate. I used the following code:
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"MM/dd/yyyy-HH:mm a"];
[formatter setLocale:[NSLocale currentLocale]];
NSDate *gameDateTime = [formatter dateFromString:gameDateTimeStr];
However, when printed on consolte, its description is: 2013-11-12 05:00:00 +0000
As you can see, the date is correct, but the time is wrong.
Please help me fix it.
There are one issues with you date formatter, first you are using 24 hour format, HH for the hours in the date format. But you example uses 12 hour format and hh should be used.
[formatter setDateFormat:#"MM/dd/yyyy-hh:mm a"];
Depending on you timezone offset the date is parsed correctly, since date printedby NSLog is is represented in GMT.
When you create a string form the date object use NSDateFormatter you timezone is used to calculate the correct time offset.
As simple as
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"dd/MM/yyyy"];
NSLog(#"Current date in event %# %#",currentDate,[df stringFromDate:currentDate]);
But in the log
Current date in event 2013-10-01 22:00:00 +0000 02/10/2013
Why?
When you log an NSDate it always prints in UTC time. When you use stringFromDate: you get a date in local time unless you change the timezone of the date formatter.
In this case you are in a timezone two hours ahead of UTC (assuming you are in Italy).
Since the NSDate object is October 1, 2013 at 22:00 UTC, this is the same as midnight of October 2, 2013 at UTC+2. This is why you see the string showing October 2.
Here's another way to look at it. You are not seeing a 1 day difference. You are actually seeing a 2 hour difference due to your timezone. From midnight to 0200 hours your time, you will see what appears to be a 1 day difference.
I'm having a problem with NSDate instance.
For the date I'm receiving 2012-08-16 00:00:00 +0000.
But I need to remove from the 00:00:00 +0000.
Is there any way to do that?
NSDateFormatter *formatter = [[[NSDateFormatter alloc] init]autorelease];
[formatter setDateFormat:#"yyyy-MM-dd"];
[formatter setTimeZone:[NSTimeZone timeZoneWithName:#"GMT"]];
NSDate *eventDate = [formatter dateFromString:currentDate]; // current Tile
NSLog(#"date %#",eventDate);
Use
NSLog(#"date %#",[formatter stringFromDate:eventDate]);
A NSDate is just a single point in time. It does not know how it's value should be formatted, that's what NSDateFormatter is for.
NSLog(#"date %#",eventDate); prints the default string representation of the date.
A date formatter converts strings into dates and dates into strings. An NSDate represents an point in time, regardless how you created it. In your code you seem to be thinking that the NSDate will "remember" that the formatter it came from didn't specify a time of day; it won't. When you call dateFromString: it will simply pick 00:00:00 (midnight) as the time.
If you need to work with calendar dates regardless of the time, you can either:
Use NSDate objects and ignore the time component. You will need to be wary of time zones, since midnight on August 15th in one time zone can be 11pm on August 14th in another.
Use a different data structure to store year, month, and day. NSDateComponents is a good candidate, or you could create your own.
I have a date string as follows: "Fri, 17 Jun 2011 19:20:51 PDT" which I need to parse into an NSDate format.
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"EEE, d MM YYYY HH:mm:ss zzz"];
NSDate *date = [dateFormatter dateFromString:currentPubDate ];
[dateFormatter release];
The code doesn't appear to be working and I am not sure why. I have looked into the issue but searching through forums etc and can't seem to find an answer. I do believe it is an issue with the dateFormatter. Thanks for your help
You incorrectly specified your setDateFormat string. This is how you should have specified it:
[dateFormatter setDateFormat:#"EEE, dd MMM yyyy HH:mm:ss zzz"];
YYYY is only used in the "Week date" format used for some industrial and commercial applications. It looks like this: YYYY-Www-D where 2011-W1-3 would equate to the third day of the first week of 2011.
The Apple docs note that it is a common mistake to use YYYY instead of yyyy: Fixed Formats
Try replacing MM with MMM -- I dont have XCode handy to verify but typically "M" or "MM" will refer to numeric month. In your case since you have "Jun" you should try MMM.
You can also do the following:
NSDateFormatter has the properties: dateStyle & timeStyle
You can set these to NSDateFormatterNoStyle, NSDateFormatterShortStyle, NSDateFormatterMediumStyle, NSDateFormatterLongStyle, NSDateFormatterFullStyle
Once these are set you can use stringFromDate: to get a nicely formatted string.
Check out the documentation page for each style does to the time and date.
https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html#//apple_ref/c/tdef/NSDateFormatterStyle
Cheers!