NSDate *createDate = [NSDate dateWithTimeIntervalSince1970:1376460694.103];
NSLog(#"createDate %#",createDate);
I am using the above code to get the current date and time,when I put break point at createDate,It shows correct time stamp value,but NSLog(#"createDate %#",createDate) statement is printing the date as 2013-08-14 06:11:34 +0000.
How to get the correct result?
The date is correct. When printing to the console the description of the date is used and that uses your system locale so it applies your time zone to the date before printing.
When you want to display the time you need to use a date formatter to convert the date into a string. The important part is setting the locale / time zone that the formatter uses.
Take a read of this and this.
Related
I'm developing an app for iPhone that uploads pictures to a webserver. These pictures have the time of when they were taken in the filename. Since they can be taken from anywhere in the World, I have to keep attention to timezones and DST. I thought I can use CFAbsoluteTimeGetCurrent, that shouldn't be localized ([NSDate date] returns the localized version of time, with or without "AM", "PM", "p.m." or any other variant... for example it returns Arabian characters, if your phone is set in arabic language!).
So, can you suggest me a function to convert CFAbsoluteTimeGetCurrent to a "MySQL like" date, something like "2011-11-03 14:12:10"?
My second question is: what about timezones and daylight saving? CFAbsoluteTimeGetCurrent always returns an UTC date, no matter how the iPhone timezone is set? Is it always DST-free?
Of course I know that the local iPhone date/time could be wrong, but milliseconds-precision is not important for my application :)
Thank you in advance!
What on earth do you mean by
([NSDate date] returns the localized version of time, with or without "AM", "PM", "p.m." or any other variant... for example it returns Arabian characters, if your phone is set in arabic language!).
[NSDate date] returns an NSDate* object. I'm assuming what you really mean is the output of -[NSDate description] returns a string localized in the user's current locale, but then the question is, why are you depending on the output of -[NSDate date]? If you need to format a date a certain way, you should use an NSDateFormatter.
CFAbsoluteTime represents a moment in time, independent of time zones or localization settings. If you want to format a date (i.e. an NSDate object) you should look at NSDateFormatter, which lets you specify the exact format and localization (if any) of the output string. (If you need to work at the Core Foundation level, CFDateFormatter does the same thing.)
I'm working on one iPhone application that includes date formatting. Here i'm getting date string from the server that i need to change and display of the formatted date.
Please find the below date m getting from the server
Server Date: Sat Apr 23 16:35:33 +0000 2011
This date i need to display like 2:35 AM Apr 23rd
Can anyone please help in this.
Thanks in advance.
You should use an NSDateFormatter to parse the date string you get from the server and get the corresponding NSDate (via -[NSDateFormatter dateFromString:]). You would then use a second NSDateFormatter to convert the NSDate to an NSString with the desired date format. Unless you absolutely require a very specific display format, you should use +[NSDateFormatter dateFormatFromTemplate:options:locale:] to get a date format that a) includes all the details you want it to include and b) respects the user’s locale settings. For instance, some users might prefer a 24-hour format instead of the 12-hour format with an AM/PM designation.
I have a date time as a string, eg. "2010-08-02", I'm trying to convert it to UTC with the following code snippet
DateTime.ParseExact("2010-08-02Z", "yyyy-MM-ddZ", CultureInfo.InvariantCulture)
When I print to the console, I get the following: 8/1/2010 5:00:00 PM.
Is there a reason why the date shows up as the date before the date I'm trying to parse? I could just add a day to this to advance to the original day, but I wanted to see if there's anything I'm doing wrong in the formatting that's causing this.
EDIT: I had a mixture of being correct and not :)
It's showing you the local time represented by the UTC string. It's annoying that DateTime doesn't make this sort of thing clear, IMO. Additionally, I don't think you want to use 'Z' as the format specifier for the time zone; that's not actually a valid format specifier; it should be 'z', - but that's meant for things like "+01:00". I think you should be using 'K'. Frankly it's not clear, but if you use 'K' it round-trips correctly, certainly ('Z' roundtrips too, but only because it ignores it, treating it as plain text).
You can fix it by just calling ToUniversalTime, or (preferred IMO) specifying DateTimeStyles.AdjustToUniversal as an extra argument:
DateTime dt = DateTime.ParseExact("2010-08-02Z", "yyyy-MM-ddK",
CultureInfo.InvariantCulture,
DateTimeStyles.AdjustToUniversal);
The UTC of midnight for 2010-08-02 happens to be at 5pm on 2010-08-01.
If the original string is just a date in the format "2010-08-02" (without the Z), then why not just:
DateTime.SpecifyKind(
DateTime.ParseExact("2010-08-02",
"yyyy-MM-dd",
CultureInfo.InvariantCulture),
DateTimeKind.Utc);
ParseExact will presumably return a DateTime with Kind = Unspecified, and you can make it UTC or Local as you wish using SpecifyKind.
I'm working with some videogame server data. The server returns a dictionary with past game details. One of the fields is for the date. That returned object is a string like this:
/Date(1286749014000-0700)/
I'm not exactly sure how that string translates into the date, but it should represent Sunday, October 10, 2010, 3:16 PM.
Is this a Unix timestamp? Do they usually have a suffix like -0700?
Thank you
The number 1286749014 stands for 10 october 2010 5:16:54 pm. So if you substract the 700 from it you should get the right date and time.
Check out the Wikipedia article on Unix time for more information on how it's made up.
The first part ("128674901") exactly represents "Sun, 10 Oct 2010 22:16:54 GMT" date.
In objective-c you can use something like this:
NSTimeInterval unixDate = 128674901;
NSDate *date = [NSDate dateWithTimeIntervalSince1970:unixDate];
It looks like you have a high resolution time with timezone offset.
The "0700" suffix is a time zone.
Which means UTC -07
I'm sorry to make my first question here a bit of a simple one -- I've spent a day reading the NSLocale and NSCalendar class descriptions but I couldn't see if this was possible.
I have a UIDatePicker in the UIDatePickerModeDateAndTime mode. It is currently displaying date and time according to the user's locale, which is the default behavior.
I would like to be able to offer the option to show the UIDatePicker in either 12-hour or 24-hour time format. Detecting which time format the user is currently using isn't a problem, but I'm not clear on how to change just the time format of UIDatePicker without entirely throwing out the user's locale settings (since the picker also displays the localized days of the week and months). UIDatePicker supports setting its locale and setting its calendar.
So, question one is whether this is something I should be trying to do via NSLocale or NSCalendar, and question two is if anyone can recommend a way to isolate the time format without throwing out the rest of the user's locale settings.
Thanks for any suggestions.
This is not the answer you are looking for, but in Cocoa you could create an NSDateFormatter and attach it to an NSDatePicker (which is an NSControl) using setFormatter. Unfortunately the equivalent iPhone class (UIControl) does not support this yet. I raised a bug with Apple about it and this is a known issue, although they wouldn't tell me if/when they plan to fix/enhance it.
OK, after reading the last two years' worth of others asking the same question here, it seems that there is no way to do this since the UIDatePicker uses the user's country setting instead of the user's locale setting, and that can't be overridden programmatically. I filed a bug.
I have solved this problem by using the user input of AM/PM by initializing another variable as a string of either AM or PM based upon the 12 hour format. The new hour in 24 hour format is put into NSCalendar. To wit:
var hra = 1//ENTER INITIAL HOUR (HH)
var dna = "PM"//ENTER "AM" OR "PM"
if hra <= 12 && dna == "PM"{
hra = hra + 12
}
The variable hra now takes the value of the 24 hour format.