I am getting current date by using this
NSDate *currDate;
currDate = [NSDate date];
But If user opens my app from other country also the currDate should be Indian time only.
How can I do this?
Check if this helps, there could be multiple ways of approaching this - but this is readable -
NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterLongStyle];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:#"Asia/Kolkata"]];
NSString *indianTimeZone = [dateFormatter stringFromDate:currentDate];
NSLog(#"%#", indianTimeZone);
I learned about "Asia/Kolkata" by logging -
NSLog(#"%#", [NSTimeZone knownTimeZoneNames]);
Also, checkout this answer, I like this approach.
Related
I asked a question not too long ago about timezone and I was using EST. Users suggested me to use EDT. I want to know why I should use one or the other because they both print the same time for me. Here is the code to better illustrate what I mean.
NSDate *today = [NSDate date];
NSDateFormatter *edtDf = [[NSDateFormatter alloc] init];
[edtDf setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"EDT"]];
[edtDf setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSString *stringDate = [edtDf stringFromDate:today];
NSLog(#"The EDT is %#", stringDate);
NSDate *today1 = [NSDate date];
NSDateFormatter *estDf = [[NSDateFormatter alloc] init];
[estDf setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"EST"]];
[estDf setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSString *stringDate1 = [estDf stringFromDate:today1];
NSLog(#"The EST is %#", stringDate1);
They may print different things depending on the time of year (since time of year determines whether Daylight Saving Time is active).
Don't use EST or EDT. Use US/Eastern or America/New_York:
NSTimeZone *tz = [NSTimeZone timeZoneWithName:#"US/Eastern"];
// or
NSTimeZone *tz = [NSTimeZone timeZoneWithName:#"America/New_York"];
These time zones adjust for Daylight Saving Time at the correct times of the year.
It looks easy, but I couldn't figure out a proper way to do this. I need to create an NSString from a NSDate which represents the same time on every device, independently from the iPhone's time zone settings.
Suppose userA is in London, where the actual time is 14:00, userB is in New York where is 9:00 and userC is in Hong Kong, where the actual time is 21:00.
NSDate *now = [[NSDate alloc] init];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"MM/dd/yy HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate:now];
Actually with this code I'm getting these results (when I log the dateString):
userA: 08/12/14 14:00:00
userB: 08/12/14 09:00:00
userC: 08/12/14 21:00:00
But I need to create dates like this
userA: 08/12/14 14:00:00
userB: 08/12/14 14:00:00
userC: 08/12/14 14:00:00
My goal is to create a "system/absolute time" which is the same inside the app and doesn't matter the original time zone of the user's device. The end result must look like this MM/dd/yy HH:mm:s.
Is it possible to get the NSDate *now = [[NSDate alloc] init]; from a pre-defined timezone? For example it could always use the actual time of the GMT-00 timezone.
I've tried to do it with this code, but when I run the code, the console writes out the wrong date (based on the device time zone setting) again, so I don't have a better idea. I would appreciate any ideas.
NSDate *now = [[NSDate alloc] init];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.timeZone = [NSTimeZone timeZoneWithAbbreviation:#"Europe/London"];
[dateFormatter setDateFormat:#"MM/dd/yy HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate:now];
NSLog(#"the date is %#,", dateString);
The below code should work. What ever the timezone you are in it will always display the time in UTC.
NSDate *now = [[NSDate alloc] init];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[[NSTimeZone alloc] initWithName:#"UTC"]];
[dateFormatter setDateFormat:#"MM/dd/yy HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate:now];
NSLog(#"%#",dateString);
Between the following two threads, I think you'll find everything you need (and thensome). The first is an extensive example of a problem similar to yours (just remember to look at the code in the answers and not the question), while the second has all the time zone abbreviations that you'll ever need. Gotta love the helpful people on The Stack.
The links again, just in case
objective-c: Conversion between TimeZones
GMT timezone conversion in objective c
NSDate *localDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
dateFormatter.dateFormat = #"MM/dd/yy";
NSString *dateString = [dateFormatter stringFromDate: localDate];
NSDateFormatter *timeFormatter = [[NSDateFormatter alloc]init];
timeFormatter.dateFormat = #"HH:mm:ss";
NSString *dateString = [timeFormatter stringFromDate: localDate];
How can we get the date / time with the following format:
YYYY-MM-DD HH:MM:ss.mmm
In fact, I have to create a trace class to trace the communication flow between iOS device and another device. I need this format to have a good time stamp.
It should be:
NSString *MyString;
NSDate *now = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd' 'HH:mm:ss.SSS"];
MyString = [dateFormatter stringFromDate:now];
This question already has answers here:
NSDate is not returning my local Time zone /default time zone of device
(7 answers)
Closed 9 years ago.
I am using the datepicker for picking the time but after sending to the server when I am retrieving back then its showing 5-6 hour difference.
Server hosted in USA.
So how I will do it accurately without any difference, User do request from any where.
Thanks,
Arun
UTC is standard time zone to be used. Following is the code to get date in UTC
+(NSString *)getCurrentTime{
NSDate *date = [NSDate date];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-ddHH:mm:ss"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
NSString *dateStr = [dateFormat stringFromDate:date];
RELEASE_OBJECT(date)
RELEASE_OBJECT(dateFormat)
return dateStr;
}
Send the date with the timezone. For example:
NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"];
NSDate *date = [formatter dateFromString:dateString];
Will include the timezone and the server will be able to translate to its own timezone.
We use the ISO 8601 for better compatibility. There are also NSFormatter subclasses that to convert from ISO 8601 to NSDate and back (like this).
It is time zone issue. You can use [yourDate dateByAddingInterval:[NSTimeZone secondsFromGMT]]; .
Please try to set the Locale for the time:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd MM yyyy hh:mm:ss"];
[dateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:#"en_US"] autorelease]];
NSDate* sourceDate = [dateFormatter dateFromString:dateString];
//Timezones
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:#"UTC"];
NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];
//Interval in Timezones
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;
//converted date
NSDate* destinationDate = [[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate] ;
NSString *strFinalDate = [dateFormatter stringFromDate:destinationDate];
[dateFormatter release];
[destinationDate release];
If you are sending your iPhone default times to server and server is also sending the same time which you have send it then it will be problem of the converting your NSDate to NSString with NSDateFormatter with some different timezone.
[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
Use above code when you using NSDateFormatter.
I would like to keep track of the date with timestamp. What objective-C/cocoa class could I use to get the timestamp local to the machine's time settings?
if for example I'm in USA, timestamp should be in terms of the area where I'm at. If I'm in Europe, should be in Europe time.
Take a look at NSDate. For example,
NSDate *today = [NSDate date];
will give you the current date and time.
You can use this.
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
NSString *currentTime = [dateFormatter stringFromDate:[NSDate date]]
NSLog(#"Current Date:%#",currentTime);
I hope this is use full to you.