I'm passing a string from javascript to Objective-C in the form of "2012-02-17 14:21:30 +0000".
My code is as follows:
NSString *firingDate = [_parameters objectForKey:#"fire"];
NSDate *notificationDate = [NSDate dateWithString:firingDate];
The issue is that I ended up reading the OS X reference instead of the iOS docs (doh!) so this throws a warning as dateWithString isn't present in iOS. In theory I suppose that this shouldn't work at all but it does, albeit with that warning.
What is the Correct way to convert the string to a NSDate?
The correct way is to use NSDateFormatter as a factory to create dates from strings (and vice versa).
Try:
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = #"YYYY-MM-dd HH:mm:ss Z";
NSDate *notificationDate = [formatter dateFromString:firingDate];
Try this:
NSString *firingDate = [_parameters objectForKey:#"fire"];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSDate *notificationDate = [dateFormatter dateFromString:firingDate];
Check out the reference for parsing dates from multiple regions.
Don't forget to release your formatter when finished.
Related
My python backend uses the isoformat() method on UTC date times, which results in strings that look like 2014-01-14T18:07:09.037000. Following other examples, I'm trying to create NSDates from those strings (passed up in JSON packets):
NSDateFormatter *dateFormatter = [NSDateFormatter new];
[dateFormatter setDateFormat:#"yyyy-MM-dd'T'HH:mm:S"];
NSLog(#"cycle_base %#", myFields[#"cycle_base"]);
self.cycleBase = [dateFormatter dateFromString: myFields[#"cycle_base"]];
NSLog(#"cycleBase %#", self.cycleBase);
I've tried variants on the S part (which is supposed to be fractional seconds?) of the format string, but to no avail. I always get a nil back. What am I doing wrong?
iOS 7 follows the Unicode Technical Standard #35, which is a list of format patterns.
In this document you will find that the format string for fractional seconds is capitalized S.
NSString *string = #"2014-01-14T18:07:09.037000";
NSDateFormatter *formatter = [NSDateFormatter new];
formatter.dateFormat = #"yyyy-MM-dd'T'HH:mm:ss.S";
NSDate *date = [formatter dateFromString:string];
NSLog(#"%#", date);
This will net you a valid NSDate object. Don't forget to set the proper time zone and locale on your NSDateFormatter object.
I'm having problems converting a string into a NSDate object and I'm not sure why.
NSString* tester= #"2012-11-26T10:20:40.187";
NSLog(#"", tester); //Print the Date String
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"];
NSDate *date = [formatter dateFromString:tester]; //Store the date
NSDateFormatter *output = [[NSDateFormatter alloc] init];
[output setDateStyle:NSDateFormatterMediumStyle];
NSLog(#"DATE OBJECT:%#\nDATE STRING: \"%#\"", [output stringFromDate:date]); //Print the NSDate object and the string
But all I seem to get is:
DATE OBJECT:(null)
DATE STRING: "2012-11-26T10:20:40.187"
I figure it has something to do with the .187 but I'm not sure. I'm sorry if this is a duplicate but I couldn't figure this out.
Thank you very much in advance!
The abbrevation for milliseconds is "S"not Z which is TimeZone.
It seems that you have read the correct document where that example is from, but
you missed the link to the Unicode Technical Standard #35.
See NsDateFormatter Docu, search for "Formatters in Mac OS X v10.4 use version tr35-4."
try that below:
[formatter setDateFormat:#"yyyy'-'MM'-'dd'T'HH':'mm':'ss.SSS"];
See also NSDateFormatter Question
I need to convert the following string into a better readable format:
NSString *deadlineFromTable = #"2012-11-13T22:59:00.000Z";
I would like to convert this into an NSDate, so I can format it.
I tried the following, but I get an incompatible pointer error assigning NSString to NSDate when I try to set it to a UILabel (the last line):
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd-MM-yyyy"];
NSDate *dateFromString = [dateFormatter dateFromString:deadlineFromTable];
self.deadlineLbl.text = dateFromString;
Thanks for any help.
You need to use the dateFormatter twice. Once for parsing, and once for formatting your string.
You cannot assign a date as a label text directly.
Set format: yyyy-MM-dd'T'HH:mm:ss.Z and then use
NSDate *date = [dateFormatter dateFromString:dedlineFromTable];
Set format: dd-MM-yyyy and then use
NSString *text = [dateFormatter stringFromDate: date];
You need two dateFormatters.
One to convert from your input string to a date and then one to convert from that date into the Label format you want.
You also need to change the format of the date formatter so it matches your string...
NSDateFormatter *dateStringParser = [[NSDateFormatter alloc] init];
[dateStringParser setDateFormat:#"yyyy-MM-dd'T'HH:mm:ss.Z"];
NSDate *date = [dateStringParser dateFromString:deadlineFromTable];
NSDateFormatter *labelFormatter = [[NSDateFormatter alloc] init];
[labelFormatter setDateFormat:#"dd-MM-yyyy"];
self.deadlineLbl.text = [labelFormatter stringFromDate:date];
That should do it.
Im working on iphone app using xcode,objective c and targeting ios 5 minimum.
All I am trying to do is convert a string to a date. I have read lots on this and it should be a simple straight forward task. I have seen many other questions like this in forum but what is working for people doesnt seem to be working for me.
Here is what I am doing
NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSString *dobText = [dict valueForKey:#"DateOfBirth"];
NSDate *dobDate = [dateFormatter dateFromString:dobText];
the dobText is always in format #"1999-01-01" which matches the date format set in the date formatter but the result when using date from string is always nil.
can anyone explain this to me and let me know how to fix it?
Look at the user preferences on your device. The documentation says:
Note that although setting a format string (setDateFormat:) in
principle specifies an exact format, in practice it may nevertheless
also be overridden by a user’s preferences—see Data Formatting Guide
for more details.
are you sure the date is using a - and not a – in the data you get from the dict. As i can reproduce a nil result when i use a – (alt + -)
NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSString *dobText = #"2009-02-12";
NSDate *dobDate = [dateFormatter dateFromString:dobText];
NSLog(#"%#", dobDate);
Try doing this, will likely fix your problem.
NSString *dobText = [[dict valueForKey:#"DateOfBirth"] stringByReplacingOccurrencesOfString:#"—" withString:#"-"];
I suspect like bigkm say, your dashes may be getting in the way.
I would suggest you try a dummy string in line first. e.g.
NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSString *dobText = #"1999-01-01" // [dict valueForKey:#"DateOfBirth"];
NSDate *dobDate = [dateFormatter dateFromString:dobText];
Now does that work? It should. Now triangulate another way:
Remove the dashes completely from the dob text, so that it has the format 'yyyyMMdd'
Have the date formatter look for this same format
Does that work? It should. And that would prove that the separator characters in your format are the issue and need some further inspection (or cleansing as bigkm suggested).
Side node re threading: NSDateFormatter is fine if you use it on the thread on which it was created. If you don't, you'll know b/c the app will crash.
If your date format is correct, I can suggest to set NSLocale to your NSDateFormatter.
For me this code works on simulator:
NSString *format = [NSString stringWithFormat:#"EEE, dd MMM yyyy HH:mm:ss Z"];
NSDateFormatter *df = [NSDateFormatter new];
[df setDateFormat:format];
NSDate *date = [df dateFromString:pubDateSttring];
but on the device date is always NIL.
I've found workaround of setting NSLocale:
df.locale = [[NSLocale alloc] initWithLocaleIdentifier:#"en_US_POSIX"];
Ive been racking my brains with no luck. Could someone please tell me how i would convert this string:
"2011-01-13T17:00:00+11:00"
into a NSDate?
The unicode date format doc is here
Also, for your situation, you could try this:
// original string
NSString *str = [NSString stringWithFormat:#"2011-01-13T17:00:00+11:00"];
// convert to date
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
// ignore +11 and use timezone name instead of seconds from gmt
[dateFormat setDateFormat:#"YYYY-MM-dd'T'HH:mm:ss'+11:00'"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:#"Australia/Melbourne"]];
NSDate *dte = [dateFormat dateFromString:str];
NSLog(#"Date: %#", dte);
// back to string
NSDateFormatter *dateFormat2 = [[NSDateFormatter alloc] init];
[dateFormat2 setDateFormat:#"YYYY-MM-dd'T'HH:mm:ssZZZ"];
[dateFormat2 setTimeZone:[NSTimeZone timeZoneWithName:#"Australia/Melbourne"]];
NSString *dateString = [dateFormat2 stringFromDate:dte];
NSLog(#"DateString: %#", dateString);
[dateFormat release];
[dateFormat2 release];
Hope this helps.
put the T part in single quotes, and check the unicode docs for the exact formatting. In my case, I have something similar, which I do this:
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"YYYY-MM-dd'T'HH:mm:ss.SSS"];
Again, not exactly the same, but you get the idea. Also, be careful of the timezones when converting back and forth between strings and nsdates.
Again, in my case, I use:
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:#"America/New_York"]];
Did you try this
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSDate *dateT = [dateFormatter dateFromString:str];
Cheers
You might check out TouchTime.
https://github.com/jheising/TouchTime.
It's a direct port of the awesome strtotime function in PHP in 5.4 for Cocoa and iOS. It will take in pretty much any arbitrary format of date or time string and convert it to an NSDate.
Hope it works, and enjoy!
Try using this cocoapods enabled project. There are many added functions that will probably be needed as well.
"A category to extend Cocoa's NSDate class with some convenience functions."
https://github.com/billymeltdown/nsdate-helper
Here's an example from their page:
NSDate *date = [NSDate dateFromString:#"2009-03-01 12:15:23"];