iOS Convert UTC NSDate to local Timezone

Question

How do I convert a UTC NSDate to local timezone NSDate in Objective C or and Swift

User · Answer

Convert the date from the UTC calendar to one with the appropriate local NSTimeZone

User · Answer

The easiest method I ve found is this   NSDate  someDateInUTC        NSTimeInterval timeZoneSeconds     NSTimeZone localTimeZone  secondsFromGMT   NSDate  dateInLocalTimezone    someDateInUTC dateByAddingTimeInterval timeZoneSeconds

User · Answer

You can try this one   NSDate  currentDate     NSDate alloc  init   NSTimeZone  timeZone    NSTimeZone defaultTimeZone   NSDateFormatter  dateFormatter     NSDateFormatter alloc  init    dateFormatter setDateStyle NSDateFormatterLongStyle    dateFormatter setTimeStyle NSDateFormatterLongStyle    dateFormatter setTimeZone timeZone    dateFormatter setDateFormat   ZZZ    NSString  localDateString    dateFormatter stringFromDate currentDate   NSMutableString  mu    NSMutableString stringWithString localDateString    mu insertString      atIndex 3    NSString  strTimeZone    NSString stringWithFormat    GMT       mu timeZone name    NSLog       strTimeZone

User · Answer

Swift 3   UTC to Local and Local to UTC  extension Date           Convert UTC  or GMT  to local time     func toLocalTime   - gt  Date           let timezone   TimeZone current         let seconds   TimeInterval timezone secondsFromGMT for  self           return Date timeInterval  seconds  since  self                Convert local time to UTC  or GMT      func toGlobalTime   - gt  Date           let timezone   TimeZone current         let seconds   -TimeInterval timezone secondsFromGMT for  self           return Date timeInterval  seconds  since  self

User · Answer

NSTimeInterval seconds     assume this exists NSDate  ts utc    NSDate dateWithTimeIntervalSince1970 seconds    NSDateFormatter  df utc      NSDateFormatter alloc  init  autorelease    df utc setTimeZone  NSTimeZone timeZoneWithName   UTC      df utc setDateFormat   yyyy MM dd G  at  HH mm ss zzz     NSDateFormatter  df local      NSDateFormatter alloc  init  autorelease    df local setTimeZone  NSTimeZone timeZoneWithName   EST      df local setDateFormat   yyyy MM dd G  at  HH mm ss zzz     NSString  ts utc string    df utc stringFromDate ts utc   NSString  ts local string    df local stringFromDate ts utc       you can also use NSDateFormatter dateFromString to go the opposite way   Table of formatting string parameters   https   waracle com iphone-nsdateformatter-date-formatting-table   If performance is a priority  you may want to consider using strftime  https   developer apple com legacy library documentation Darwin Reference ManPages man3 strftime 3 html

User · Answer

Please use this code  NSDateFormatter  dateFormatter     NSDateFormatter alloc  init    dateFormatter setDateFormat   quot yyyy-MM-dd T HH mm ss quot      dateFormatter setTimeZone  NSTimeZone timeZoneWithAbbreviation   quot UTC quot     NSDate  date    dateFormatter dateFromString   quot 2015-04-01T11 42 00 quot       create date from string   dateFormatter setDateFormat   quot EEE  MMM d  yyyy - h mm a quot     dateFormatter setTimeZone  NSTimeZone localTimeZone    NSString  timestamp    dateFormatter stringFromDate date

User · Answer

Since no one seemed to be using NSDateComponents  I thought I would pitch one in    In this version  no NSDateFormatter is used  hence no string parsing  and NSDate is not used to represent time outside of GMT  UTC   The original NSDate is in the variable i date   NSCalendar  anotherCalendar     NSCalendar alloc  initWithCalendarIdentifier i anotherCalendar   anotherCalendar timeZone    NSTimeZone timeZoneWithName i anotherTimeZone    NSDateComponents  anotherComponents    anotherCalendar components  NSCalendarUnitEra   NSCalendarUnitYear   NSCalendarUnitMonth   NSCalendarUnitDay   NSCalendarUnitHour   NSCalendarUnitMinute   NSCalendarUnitSecond   NSCalendarUnitNanosecond  fromDate i date       The following is just for checking    anotherComponents calendar   anotherCalendar     anotherComponents date is nil without this NSDate  anotherDate   anotherComponents date    i anotherCalendar could be NSCalendarIdentifierGregorian or any other calendar  The NSString allowed for i anotherTimeZone can be acquired with  NSTimeZone knownTimeZoneNames   but anotherCalendar timeZone could be  NSTimeZone defaultTimeZone  or  NSTimeZone localTimeZone  or  NSTimeZone systemTimeZone  altogether   It is actually anotherComponents holding the time in the new time zone  You ll notice anotherDate is equal to i date  because it holds time in GMT  UTC

User · Answer

If you want local Date and time  Try this code -  NSString  localDate    NSDateFormatter localizedStringFromDate  NSDate date  dateStyle NSDateFormatterMediumStyle timeStyle NSDateFormatterMediumStyle

User · Answer

Convert your UTC date to Local Date  - NSString   getLocalDateTimeFromUTC  NSString   strDate       NSDateFormatter  dtFormat     NSDateFormatter alloc  init        dtFormat setDateFormat   yyyy-MM-dd HH mm ss         dtFormat setTimeZone  NSTimeZone timeZoneWithAbbreviation   UTC         NSDate  aDate    dtFormat dateFromString strDate         dtFormat setDateFormat   yyyy-MM-dd HH mm ss         dtFormat setTimeZone  NSTimeZone systemTimeZone         return  dtFormat stringFromDate aDate       Use Like This  NSString  localDate    self getLocalDateTimeFromUTC   yourUTCDate

User · Answer

Convert UTC time to current time zone   call function  NSLocale  locale    NSLocale autoupdatingCurrentLocale    NSString  myLanguageCode    locale objectForKey  NSLocaleLanguageCode   NSString  myCountryCode    locale objectForKey  NSLocaleCountryCode    NSString  rfc3339DateTimeString     2015-02-15 00 00 00    NSDate  myDateTime    NSDate    myCommonFunctions  ConvertUTCTimeToLocalTimeWithFormat rfc3339DateTimeString LanguageCode myLanguageCode CountryCode myCountryCode Formated NO     Function  -NSObject   ConvertUTCTimeToLocalTimeWithFormat rfc3339DateTimeString     LanguageCode  NSString   lgc CountryCode  NSString   ctc Formated  BOOL  formated       NSDateFormatter  sUserVisibleDateFormatter   nil      NSDateFormatter  sRFC3339DateFormatter   nil       NSTimeZone  timeZone    NSTimeZone defaultTimeZone        if  sRFC3339DateFormatter    nil                sRFC3339DateFormatter     NSDateFormatter alloc  init            NSLocale  myPOSIXLocale     NSLocale alloc  initWithLocaleIdentifier  NSString stringWithFormat        timeZone              sRFC3339DateFormatter setLocale myPOSIXLocale            sRFC3339DateFormatter setDateFormat   yyyy - MM - dd T HH   mm   ss Z              sRFC3339DateFormatter setTimeZone  NSTimeZone timeZoneForSecondsFromGMT 0                  Convert the RFC 3339 date time string to an NSDate      NSDate  date    sRFC3339DateFormatter dateFromString rfc3339DateTimeString        if  formated    YES                NSString  userVisibleDateTimeString           if  date    nil                        if  sUserVisibleDateFormatter    nil                                sUserVisibleDateFormatter     NSDateFormatter alloc  init                    sUserVisibleDateFormatter setDateStyle NSDateFormatterMediumStyle                    sUserVisibleDateFormatter setTimeStyle NSDateFormatterShortStyle                                 Convert the date object to a user-visible date string              userVisibleDateTimeString    sUserVisibleDateFormatter stringFromDate date                return  NSObject  userVisibleDateTimeString                       return  NSObject  date

User · Answer

I write this Method to convert date time to our LocalTimeZone  -Here  NSString   TimeZone parameter is a server timezone  - NSString   convertTimeIntoLocal  NSString   defaultTime   NSString   TimeZone       NSDateFormatter  serverFormatter     NSDateFormatter alloc  init        serverFormatter setTimeZone  NSTimeZone timeZoneWithAbbreviation TimeZone         serverFormatter setDateFormat   yyyy-MM-dd HH mm ss        NSDate  theDate    serverFormatter dateFromString defaultTime       NSDateFormatter  userFormatter     NSDateFormatter alloc  init        userFormatter setDateFormat   yyyy-MM-dd HH mm ss         userFormatter setTimeZone  NSTimeZone localTimeZone        NSString  dateConverted    userFormatter stringFromDate theDate       return dateConverted

User · Answer

Here input is a string currentUTCTime  in format 08 30 2012 11 11  converts input time in GMT to system set zone time    UTC time NSDateFormatter  utcDateFormatter      NSDateFormatter alloc  init  autorelease    utcDateFormatter setDateFormat   MM dd yyyy HH mm     utcDateFormatter setTimeZone   NSTimeZone timeZoneForSecondsFromGMT  0        utc format NSDate  dateInUTC    utcDateFormatter dateFromString  currentUTCTime       offset second NSInteger seconds     NSTimeZone systemTimeZone  secondsFromGMT       format it and send NSDateFormatter  localDateFormatter      NSDateFormatter alloc  init  autorelease    localDateFormatter setDateFormat   MM dd yyyy HH mm     localDateFormatter setTimeZone   NSTimeZone timeZoneForSecondsFromGMT  seconds        formatted string NSString  localDate    localDateFormatter stringFromDate  dateInUTC   return localDate

User · Answer

This is basic way to get time of any GMT time   NSDateFormatter  formatter     NSDateFormatter alloc  init    formatter setDateFormat   hh mm a        09 30 AM  formatter setTimeZone  NSTimeZone timeZoneForSecondsFromGMT 1       For GMT 1 NSString  time    formatter stringFromDate  NSDate date        Current time

User · Answer

EDIT When i wrote this I didn t know I should use a dateformatter which is probably a better approach  so check out slf s answer too   I have a webservice that returns dates in UTC  I use toLocalTime to convert it to local time and toGlobalTime to convert back if needed   This is where I got my answer from   https   agilewarrior wordpress com 2012 06 27 how-to-convert-nsdate-to-different-time-zones     implementation NSDate Utils   - NSDate    toLocalTime     NSTimeZone  tz    NSTimeZone defaultTimeZone     NSInteger seconds    tz secondsFromGMTForDate  self     return  NSDate dateWithTimeInterval  seconds sinceDate  self      - NSDate    toGlobalTime     NSTimeZone  tz    NSTimeZone defaultTimeZone     NSInteger seconds   - tz secondsFromGMTForDate  self     return  NSDate dateWithTimeInterval  seconds sinceDate  self       end

[ios] iOS: Convert UTC NSDate to local Timezone

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