How to get the timezone offset in GMT Like GMT 7 00 from android device

Question

I am getting the timezone of a android device using this code   TimeZone tz   TimeZone getDefault    String current Time Zone    TimeZone getTimeZone tz getID    getDisplayName                  false  TimeZone SHORT     But it always return me the timezone like  IST  but i want to get the timezone in GMT like this GMT 7 00

User · Answer

Use this code  Opt 1          Opt 1     Calendar calendar   Calendar getInstance TimeZone getTimeZone  GMT                Locale getDefault         Date currentLocalTime   calendar getTime        DateFormat date   new SimpleDateFormat  Z   Locale getDefault         String localTime   date format currentLocalTime       String finalTimezone   String format  GMT s  s   localTime substring 0  3   localTime substring 3        Log d TAG   timezone 1      finalTimezone          Opt 2     date   new SimpleDateFormat  z  Locale getDefault         localTime   date format currentLocalTime       Log d TAG   timezone 2    localTime          Opt 3     TimeZone tz   TimeZone getDefault        Log d TAG   timezone 3    tz getDisplayName true  TimeZone SHORT             If I m in Los Angeles  GTM-07 00 Pacific Standard Time  the output is   timezone 1  GMT-07 00 timezone 2  PDT timezone 3  PDT

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You can get your custom GMT time from this function from here    public static String getCurrentDate             SimpleDateFormat sdf   new SimpleDateFormat  yyyy MM dd hh mm a zzz            Date date   new Date            sdf setTimeZone TimeZone getTimeZone  GMT 6 00             return sdf format date

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The best solution that i found for myself  SimpleDateFormat  XXX   Locale getDefault    format System currentTimeMillis          03 00   You can try to change pattern  the  xxx  string  to get the result you want  for example   SimpleDateFormat  XX   Locale getDefault    format System currentTimeMillis          0300   SimpleDateFormat  X   Locale getDefault    format System currentTimeMillis          03   Pattern can also apply another letters and the result will be different  SimpleDateFormat  Z   Locale getDefault    format System currentTimeMillis          0300   More about this you can find here  https   developer android com reference java text SimpleDateFormat html

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Generally you cannot translate from a time zone like Asia Kolkata to a GMT offset like  05 30 or  07 00  A time zone  as the name says  is a place on earth and comprises the historic  present and known future UTC offsets used by the people in that place  for now we can regard GMT and UTC as synonyms  strictly speaking they are not   For example  Asia Kolkata has been at offset  05 30 since 1945  During periods between 1941 and 1945 it was at  06 30 and before that time at  05 53 20  yes  with seconds precision   Many other time zones have summer time  daylight saving time  DST  and change their offset twice a year   Given a point in time  we can make the translation for that particular point in time  though  I should like to provide the modern way of doing that   java time and ThreeTenABP      ZoneId zone   ZoneId of  Asia Kolkata         ZoneOffset offsetIn1944   LocalDateTime of 1944  Month JANUARY  1  0  0               atZone zone               getOffset        System out println  Offset in 1944      offsetIn1944        ZoneOffset offsetToday   OffsetDateTime now zone               getOffset        System out println  Offset now      offsetToday     Output when running just now was    Offset in 1944   06 30 Offset now   05 30    For the default time zone set zone to ZoneId systemDefault     To format the offset with the text GMT use a formatter with OOOO  four uppercase letter O  in the pattern       DateTimeFormatter offsetFormatter   DateTimeFormatter ofPattern  OOOO        System out println offsetFormatter format offsetToday         GMT 05 30   I am recommending and in my code I am using java time  the modern Java date and time API  The TimeZone  Calendar  Date  SimpleDateFormat and DateFormat classes used in many of the other answers are poorly designed and now long outdated  so my suggestion is to avoid all of them   Question  Can I use java time on Android   Yes  java time works nicely on older and newer Android devices  It just requires at least Java 6    In Java 8 and later and on newer Android devices  from API level 26  the modern API comes built-in  In Java 6 and 7 get the ThreeTen Backport  the backport of the modern classes  ThreeTen for JSR 310  see the links at the bottom   On  older  Android use the Android edition of ThreeTen Backport  It   s called ThreeTenABP  And make sure you import the date and time classes from org threeten bp with subpackages    Links   Oracle tutorial  Date Time explaining how to use java time  Java Specification Request  JSR  310  where java time was first described  ThreeTen Backport project  the backport of java time to Java 6 and 7  ThreeTen for JSR-310   ThreeTenABP  Android edition of ThreeTen Backport Question  How to use ThreeTenABP in Android Project  with a very thorough explanation

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a one line solution is to use the Z symbol like   new SimpleDateFormat pattern  Locale getDefault    format System currentTimeMillis       where pattern could be    Z ZZ ZZZ  -0800 ZZZZ  GMT-08 00 ZZZZZ  -08 00   full reference here   http   developer android com reference java text SimpleDateFormat html

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public static String getCurrentTimezoneOffset          TimeZone tz   TimeZone getDefault          Calendar cal   GregorianCalendar getInstance tz       int offsetInMillis   tz getOffset cal getTimeInMillis          String offset   String format   02d  02d   Math abs offsetInMillis   3600000   Math abs  offsetInMillis   60000    60        offset    offsetInMillis  gt   0          -     offset       return offset

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Adding dst offset will solve this       int offsetInMillis   TimeZone getDefault   getRawOffset   TimeZone getDefault   getDSTSavings        String offset   String format   02d  02d   Math abs offsetInMillis   3600000   Math abs  offsetInMillis   60000    60        offset    offsetInMillis  gt   0          -     offset      return offset

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I ve been looking at this too and trying to work out how to apply timezone and DST   Here s my code       public long applyGMTOffsetDST long time           Works out adjustments for timezone and daylight saving time      Calendar mCalendar   new GregorianCalendar          TimeZone mTimeZone   mCalendar getTimeZone          boolean dstBool   mTimeZone getDefault   inDaylightTime  new Date             add an hour if DST active      if  dstBool    true            time   time   secondsPerHour               add offest hours     int mGMTOffset   mTimeZone getRawOffset         if  mGMTOffset  gt  0            long offsetSeconds   secondsPerHour   mGMTOffset          time   time   offsetSeconds             return time      This seems to work  but is there a better way to get the actual time off the device which represents a time that is meaningful and accurate to the user

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Here is a solution to get timezone offset in  GMT 05 30 this format  public String getCurrentTimezoneOffset          TimeZone tz   TimeZone getDefault          Calendar cal   GregorianCalendar getInstance tz       int offsetInMillis   tz getOffset cal getTimeInMillis          String offset   String format   02d  02d   Math abs offsetInMillis   3600000   Math abs  offsetInMillis   60000    60        offset    GMT   offsetInMillis  gt   0          -     offset       return offset

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This code return me GMT offset   Calendar calendar   Calendar getInstance TimeZone getTimeZone  GMT                    Locale getDefault     Date currentLocalTime   calendar getTime    DateFormat date   new SimpleDateFormat  Z    String localTime   date format currentLocalTime     It returns the time zone offset like this   0530  If we use SimpleDateFormat below   DateFormat date   new SimpleDateFormat  z  Locale getDefault     String localTime   date format currentLocalTime     It returns the time zone offset like this  GMT 05 30

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Yet another solution to get timezone offset   TimeZone tz   TimeZone getDefault    String current Time Zone   getGmtOffsetString tz getRawOffset      public static String getGmtOffsetString int offsetMillis        int offsetMinutes   offsetMillis   60000      char sign            if  offsetMinutes  lt  0            sign    -           offsetMinutes   -offsetMinutes            return String format  GMT c 02d  02d   sign  offsetMinutes 60  offsetMinutes   60

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To get date time with offset like 2019-07-22T13 39 27 397 05 00 Try following Kotlin code   fun getDateTimeForApiAsString     String      val date   SimpleDateFormat  yyyy-MM-dd T HH mm ss SSSXXX                       Locale getDefault        return date format Date        Output Formate    2019-07-22T13 39 27 397 05 00   for Pakistan   If you want other similar formats replace pattern in SimpleDateFormat as below    yyyy MM dd G  at  HH mm ss z     Output Format  2001 07 04 AD at 12 08 56 PDT  EEE  MMM d    yy     Output Format     Wed  Jul 4   01  h mm a         Output Format  12 08 PM  hh  o  clock  a  zzzz      Output Format   12 o clock PM  Pacific Daylight Time  K mm a  z     Output Format    0 08 PM  PDT  yyyyy MMMMM dd GGG hh mm aaa     Output Format     02001 July 04 AD 12 08 PM  EEE  d MMM yyyy HH mm ss Z     Output Format   Wed  4 Jul 2001 12 08 56 -0700  yyMMddHHmmssZ     Output Format    010704120856-0700  yyyy-MM-dd T HH mm ss SSSZ     Output Format   2001-07-04T12 08 56 235-0700  yyyy-MM-dd T HH mm ss SSSXXX     Output Format     2001-07-04T12 08 56 235-07 00  YYYY- W ww-u     Output Format     2001-W27-3

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TimeZone tz   TimeZone getDefault      Calendar cal   GregorianCalendar getInstance tz   int offsetInMillis   tz getOffset cal getTimeInMillis      String offset   String format   02d  02d   Math abs offsetInMillis   3600000   Math abs  offsetInMillis   60000    60    offset    offsetInMillis  gt   0          -     offset

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TimeZone tz   TimeZone getDefault      String gmt1 TimeZone getTimeZone tz getID           getDisplayName false TimeZone SHORT     String gmt2 TimeZone getTimeZone tz getID           getDisplayName false TimeZone LONG   Log d  Tag   TimeZone     gmt1   t  gmt2     See if this helps

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You can do like this           TimeZone tz   TimeZone getDefault        int offset   tz getRawOffset         String timeZone   String format   s 02d 02d   offset  gt   0          -   offset   3600000   offset   60000    60

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I stumbled upon a simple solution for this in Java8  non-Android  using the ZoneDateTime class  There may be other classes that implement the TemporalAccessor interface that work  but I haven t found them  This won t work with standard Date  DateTime  LocalDateTime  and Calender classes as far as I can tell       ZoneOffset myOffset   ZonedDateTime now   getOffset        ZoneOffset myOffset2   ZoneOffset from ZonedDateTime now         log info  ZoneOffset is     myOffset getId         should print   HH MM      log info  ZoneOffset2 is     myOffset2 getId         should print   HH MM    The nice thing about this solution is that it avoids a lot of modulo math  string generation  and parsing

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This might give you an idea on how to implement it to your liking   Calendar mCalendar   new GregorianCalendar      TimeZone mTimeZone   mCalendar getTimeZone      int mGMTOffset   mTimeZone getRawOffset      System out printf  GMT offset is  s hours   TimeUnit HOURS convert mGMTOffset  TimeUnit MILLISECONDS        TimeUnit is  java util concurrent TimeUnit

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TimeZone timeZone   TimeZone getDefault    String timeZoneInGMTFormat   timeZone getDisplayName false TimeZone SHORT     Output   GMT 5 30

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If someone is looking how to represent the GMT as a float number representing hour offset  for example  GMT-0530  to -5 5   you can use this   Calendar calendar   new GregorianCalendar    TimeZone timeZone   calendar getTimeZone    int offset   timeZone getRawOffset    long hours   TimeUnit MILLISECONDS toHours offset   float minutes    float TimeUnit MILLISECONDS toMinutes offset - TimeUnit HOURS toMillis hours     MINUTES IN HOUR  float gmt   hours   minutes

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This is how Google recommends getting TimezoneOffset   Calendar calendar   Calendar getInstance Locale getDefault     int offset   - calendar get Calendar ZONE OFFSET    calendar get Calendar DST OFFSET      60   1000    https   developer android com reference java util Date getTimezoneOffset

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public static String timeZone         Calendar calendar   Calendar getInstance TimeZone getTimeZone  GMT    Locale getDefault         String   timeZone   new SimpleDateFormat  Z   format calendar getTime         return timeZone substring 0  3         timeZone substring 3  5       returns like   03 30

[android] How to get the timezone offset in GMT(Like GMT+7:00) from android device?

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