I want to get the current time and parse it to an String in 24 hours format, for example 13:30.
This is my code:
NSDate *date = [NSDate date];
NSDateFormatter *formatter = [NSDateFormatter new];
[formatter setDateFormat:#"HH:mm"];
NSString *timeString = [formatter stringFromDate:date];
It works on the iOS simulator, but on my iPad I get 3:30 PM.
I have played around with different formats but still the same result.
Any idea why?
Thanks in advance.
The issue is the user's local is set to a 12 hour format. Set the local to en_US_POSIX to over-ride the user's setting.
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:#"en_US_POSIX"];
You need to explicitly set the locale to one with a 24 hour time.
See NSDateFormatter Locale for details on how to set the locale for the NSDateFormatter.
Note the answer by #mtb to that question. It explains how to not use a locale.
Related
I need to convert a 12 Hour time format to 24 Hour format. Specifically the PM part of a date, as the API I communicate with only accepts 24-hour format.
Example:
02:00 PM needs to be converted to 14:00.
08:30 PM needs to be converted to 20:30.
I've tried several approaches and probably been close, but I can't seem to get it quite right.
For that you need to use NSDateFormatter and convert the time format to 24 Hours format.
NSString *time12Hours = #"02:00 PM";
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"hh:mm a"];
NSDate *date = [formatter dateFromString:time12Hours];
[formatter setDateFormat:#"HH:mm"];
NSString *time24Hours = [formatter stringFromDate:date];
iPhone format strings are in Unicode format. Behind the link is a table explaining what all the letters above mean so you can build your own.
You can try this website for find your format string nsdateformatter.com whit NSDateFormatter
I am testing different time zones UTC offsets in application. And finally this code is properly working almost with all timezones. But i have an issue with Caracas.
Code that shows UTC offset.
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSLocale *enUSPOSIXLocale = [NSLocale localeWithLocaleIdentifier:#"en_US_POSIX"];
[dateFormatter setLocale:enUSPOSIXLocale];
//This NSDateFormatter will return timezone in format "UTC+XX:XX"
[dateFormatter setDateFormat:#"'UTC'xxxxx"];
NSString *formattedTimeZone = [dateFormatter stringFromDate:[NSDate date]];
return formattedTimeZone;
In Ukraine i receive UTC+03:00 and it is correct. In Caracas i receive UTC-04:00 but real offset is UTC-04:30.
Question is why i am missing -30 minutes in Caracas?
This is not a programming problem, Caracas(Venezuela) timezone has changed recently.
UTC-04:00 is correct right now.
Presidents of Venezuela had changed this a couple of times:
UTC-04:30 was used since 2007.
It was recently changed again to UTC-04:00.
http://www.bloomberg.com/news/articles/2016-04-14/maduro-orders-time-zone-change-to-battle-venezuela-power-crisis
I'm having a problem. I get incoming time strings in 12-hour format, and I'm turning them into NSDate objects. When the iPhone is in 12 hour format, no problem. But when it's in 24 Hour format, things go wrong. Here's some sample code to demonstrate:
NSString *theTime = #"3:19 PM";
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"h:mm a"]; // "3:19 PM"
NSDate *date = [formatter dateFromString:theTime];
NSString *theString = [formatter stringFromDate:date];
In 24 hour mode, date is 1970-01-01 03:19:00, and theString is "3:19" - WRONG
In 12 hour mode, date is 1970-01-01 15:19:00, and theString is "3:19 PM" - RIGHT
So... question 1: why is the device's 24 hour setting overriding my date formatter setting?
and more importantly, question 2: How do I get a proper conversion from 12 hour time to 24 hour time?
I already have code to detect if the phone is in 24 hour mode, but other than digging around in the string and swapping the 3 with a 15, there doesn't seem to be a clean way to do this.
Not sure if you still need it, but I've had a similar problem which got solved by setting the locale for the date formatter. That is, if you want to force it to 12-hour mode, regardless of the user's 24/12 hour mode setting, you should set the locale to en_US_POSIX.
The reason for this behaviour is Locale, set the correct Locale
NSString *strAgendaDate = #"01/17/2012 12:00 AM";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:#"en_US"] autorelease];
[dateFormatter setDateFormat:AgendaDateFormatForMeeting];
NSDate *meetingDate = [dateFormatter dateFromString:aStrDate];
[dateFormatter setDateFormat:AgendaDateRepresentation];
strAgendaDate = [dateFormatter stringFromDate:meetingDate];
It works for both 24-hour and 12 hour format
I believe the #"h:mm a" should be #"HH:mm a".
If you use the pre-build dateformatter in cocoa, everything will be taken care of for you.
NSDateFormatter *timeFormatter = [[[NSDateFormatter alloc] init] autorelease];
[timeFormatter setTimeStyle:NSDateFormatterShortStyle];
[timeFormatter setDateStyle:NSDateFormatterNoStyle];
NSDateFormatterShortStyle and NSDateFormatterNoStyle comes in different varieties.
Using those will make sure you respect the settings the user has selected for dates and times.
The 12-14 hour clock conversion is taken care of by the SDK, if you have a model or some value object for storing your dates try to keep them as NSDate. This way you can format them only when you need to display them. Saving dates as strings could open a world of trouble when you maybe parse them from xml where the GMT is specified separately or try to add and subtract NSTimeIntervals.
I changed from #"hh:mm:ss" to #"HH:mm:ss" and time style was changed from "1:03 PM" to "13:03".
Hope this will help you.
Okay, I left a comment, but it squished all the code together, so I'll have to "answer" my question with a comment:
Thanks. I gave it a whirl with this code:
NSString *theTime = #"3:19 PM";
NSDateFormatter *timeFormatter = [[[NSDateFormatter alloc] init] autorelease];
[timeFormatter setTimeStyle:NSDateFormatterShortStyle];
[timeFormatter setDateStyle:NSDateFormatterNoStyle];
NSDate *date = [timeFormatter dateFromString:theTime];
NSString *theString = [timeFormatter stringFromDate:date];
And date comes up nil. I ran into this earlier when I tried this route, and it's not working. Very frustrating.
Hi I am converting a GMT time to local time in my project - I getting the correct value in all simulator and in iPhone/iPod - but when I run this in iPad I am getting null,
Here is my code -
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = #"HH:mm:ss";
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:#"GMT"];
[dateFormatter setTimeZone:gmt];
NSDate *startDate = [dateFormatter dateFromString:#"14:37:00"];
NSLog(#"startDate---%#",startDate);
//This is startDate---2000-01-01 14:37:00 +0000 (in simulator/iPod/iphone)
// startDate---(null) (in ipad)
Issue is with user's ipad's time format - if it is in 12 hour format - then the above code results null
What do I do for this issue ??
bacause you time format is set to 12 hours on ipad device, the date string is in 24 hours format look at string #"14:37:00".
use
dateFormatter.dateFormat = #"hh:mm:ss";
[dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:#"en_US"];
Reference
if you want to force it to 12-hour mode, regardless of the user's 24/12 hour mode setting, you should set the locale to en_US_POSIX.
Use hh instead of HH.
hh usually is 12 hour time while HH is usually 24 hour time.
A good official reference for this, as linked by Apple themselves, is here. Another good table is here, as mentioned by Zaph.
I'm stuck on a stupid problem. According to Apple, setting the locale property on a NSDateFormatter instance would override some settings like for example whether the user prefers the 12 or the 24 hour format. A newly created NSDateFormatter instance is initialized with the current locale.
WWDC 2011 Session 117 talks about this 12/24 hour problem # 54:00.
Here is the code I'm using:
NSDate *date = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"HH:mm"];
NSLog(#"%#",[formatter stringFromDate:date]);
According to Apple's docs and the WWDC session this should output the current time with the user's preferred locale, even if the format is explicitly set to HH:mm. But for some reason, I always get the 24 hour representation. I've also tried to set the locale specifically to [NSLocale autoupdatingCurrentLocale], [NSLocale currentLocale] and a bunch of different country locales. Same result. Any ideas?
Try setting timeStyle instead of dateFormat:
formatter.timeStyle = NSDateFormatterShortStyle;
formatter.dateStyle = NSDateFormatterNoStyle;
If your prefer your own format (for example, you don't want to display years, which is included in every system provided date style), you can use j in a format template like this:
NSDateFormatter *formatter = [NSDateFormatter new];
[formatter setLocalizedDateFormatFromTemplate:#"jjmm"];