How can i get local timezone in ios? [duplicate] - ios

Question

This question already has answers here:
Get current iPhone device timezone date and time from UTC-5 timezone date and time iPhone app?
(3 answers)
Closed 8 years ago.
I need to set local timezones as per the location of the ios device.
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
or
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:#"GTC+5.30"]];
is suited?

Answer 1

// get current date/time
NSDate *today = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// display in 12HR/24HR (i.e. 11:25PM or 23:25) format according to User Settings
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
NSString *currentTime = [dateFormatter stringFromDate:today];
[dateFormatter release];
NSLog(#"User's current time in their preference format:%#",currentTime);
You can get the name of the local time zone using:
NSTimeZone *timeZone = [NSTimeZone localTimeZone];
NSString *tzName = [timeZone name];

Answer 2

This is how I do it:
NSString *strDateFormat = #"yyyy-MM-dd'T'HH:mm:ss.SSS";
// ---------------------------------------------------------
// input date is UTC date time, need to convert that time
// to user's own local device timezone to get correct date
// ---------------------------------------------------------
NSDateFormatter *dateFormatterUTC = [[NSDateFormatter alloc] init];
[dateFormatterUTC setDateFormat:strDateFormat];
[dateFormatterUTC setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
// get UTC Date first
NSDate* utcDate = [dateFormatterUTC dateFromString:strDate];
// get local date from UTC Date
NSDateFormatter *dateFormatterLocal = [[NSDateFormatter alloc] init];
[dateFormatterLocal setDateFormat:strDateFormat];
[dateFormatterLocal setTimeZone:[NSTimeZone systemTimeZone]];
// get final local date calculated by offsetting UTC Date
NSDate *localDate = [dateFormatterUTC dateFromString:[dateFormatterLocal stringFromDate:utcDate]];
NSDate *localNowDate = [dateFormatterUTC dateFromString:[dateFormatterLocal stringFromDate:[NSDate date]]];

Answer 3

NSString *dateStr = #"2012-07-16 07:33:01";
NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
[dateFormatter1 setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSDate *date = [dateFormatter1 dateFromString:dateStr];
NSLog(#"date : %#",date);
NSTimeZone *currentTimeZone = [NSTimeZone localTimeZone];
NSTimeZone *utcTimeZone = [NSTimeZone timeZoneWithAbbreviation:#"UTC"];
NSInteger currentGMTOffset = [currentTimeZone secondsFromGMTForDate:date];
NSInteger gmtOffset = [utcTimeZone secondsFromGMTForDate:date];
NSTimeInterval gmtInterval = currentGMTOffset - gmtOffset;
NSDate *destinationDate = [[[NSDate alloc] initWithTimeInterval:gmtInterval sinceDate:date] autorelease];
NSDateFormatter *dateFormatters = [[NSDateFormatter alloc] init];
[dateFormatters setDateFormat:#"dd-MMM-yyyy hh:mm"];
[dateFormatters setDateStyle:NSDateFormatterShortStyle];
[dateFormatters setTimeStyle:NSDateFormatterShortStyle];
[dateFormatters setDoesRelativeDateFormatting:YES];
[dateFormatters setTimeZone:[NSTimeZone systemTimeZone]];
dateStr = [dateFormatters stringFromDate: destinationDate];
NSLog(#"DateString : %#", dateStr);
- (Courtesy: Yuvaraj.M)

Answer 4

You can use the localTimeZone class method of NSTimeZone class to get a relative time zone object that decodes itself to become the default time zone for any locale in which it finds itself.
SRC: https://developer.apple.com/library/mac/documentation/cocoa/reference/foundation/classes/NSTimeZone_Class/Reference/Reference.html#//apple_ref/occ/clm/NSTimeZone/localTimeZone
If you need latitude and longitude: Get the official time zone database at http://www.iana.org/time-zones. Download tzdata2013g.tar.gz. There's a file in that archive named zone.tab that gives a lat/long for each time zone, for example:
CH +4723+00832 Europe/Zurich
The +4723+00832 indicates latitude = +47º23", longitude = +8º23"
(SRC:Get Timezone/country from iPhone)