How to convert UTC timestamp to device local time in android

Question

I need to convert the UTC time stamp that i get from the server to local device time  currently i get 5 hrs difference in my time  for example when i post to server the post time says 5 hours ago instead of a second ago  How to fix this issue  thanks   Below is the code that i do  long timestamp   cursor getLong columnIndex               CharSequence relTime   DateUtils                      getRelativeTimeSpanString timestamp   1000                               TimeZone getDefault   getRawOffset                                System currentTimeMillis                                DateUtils MINUTE IN MILLIS                 TextView  view  setText relTime

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I did it using Extension Functions in kotlin  fun String toDate dateFormat  String    yyyy-MM-dd HH mm ss   timeZone  TimeZone   TimeZone getTimeZone  UTC     Date       val parser   SimpleDateFormat dateFormat  Locale getDefault        parser timeZone   timeZone     return parser parse this     fun Date formatTo dateFormat  String  timeZone  TimeZone   TimeZone getDefault     String       val formatter   SimpleDateFormat dateFormat  Locale getDefault        formatter timeZone   timeZone     return formatter format this      Usage    2018-09-10 22 01 00  toDate   formatTo  dd MMM yyyy    Output   11 Sep 2018    Note   Ensure the proper validation

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This may help some one with same requirement  private String getDate long time           SimpleDateFormat formatter   new SimpleDateFormat  dd MM yyyy hh mm a            String dateString   formatter format new Date time            String date      dateString          return date

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The code in your example looks fine at first glance  BTW  if the server timestamp is in UTC  i e  it s an epoch timestamp  then you should not have to apply the current timezone offset  In other words if the server timestamp is in UTC then you can simply get the difference between the server timestamp and the system time  System currentTimeMillis    as the system time is in UTC  epoch    I would check that the timestamp coming from your server is what you expect  If the timestamp from the server does not convert into the date you expect  in the local timezone  then the difference between the timestamp and the current system time will not be what you expect   Use Calendar to get the current timezone  Initialize a SimpleDateFormatter with the current timezone  then log the server timestamp and verify if it s the date you expect   Calendar cal   Calendar getInstance    TimeZone tz   cal getTimeZone        debug  is it local time     Log d  Time zone     tz getDisplayName         date formatter in local timezone    SimpleDateFormat sdf   new SimpleDateFormat  dd MM yyyy HH mm ss    sdf setTimeZone tz       print your timestamp and double check it s the date you expect    long timestamp   cursor getLong columnIndex   String localTime   sdf format new Date timestamp   1000       I assume your timestamp is in seconds and you re converting to milliseconds  Log d  Time     localTime     If the server time that is printed is not what you expect then your server time is not in UTC   If the server time that is printed is the date that you expect then you should not have to apply the rawoffset to it  So your code would be simpler  minus all the debug logging    long timestamp   cursor getLong columnIndex   Log d  Server time     timestamp       log the device timezone    Calendar cal   Calendar getInstance    TimeZone tz   cal getTimeZone    Log d  Time zone     tz getDisplayName         log the system time    Log d  System time     System currentTimeMillis      CharSequence relTime   DateUtils getRelativeTimeSpanString      timestamp   1000      System currentTimeMillis        DateUtils MINUTE IN MILLIS      TextView  view  setText relTime

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Java  int offset   TimeZone getDefault   getRawOffset     TimeZone getDefault   getDSTSavings    long now   System currentTimeMillis   - offset   Kotlin  Int offset   TimeZone getDefault  rawOffset   TimeZone getDefault   dstSavings Long now   System currentTimeMillis   - offset

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I have do something like this to get date in local device timezone from UTC time stamp   private long UTC TIMEZONE 1470960000  private String OUTPUT DATE FORMATE  dd-MM-yyyy - hh mm a   getDateFromUTCTimestamp UTC TIMEZONE OUTPUT DATE FORMATE     Here is the function    public String getDateFromUTCTimestamp long mTimestamp  String mDateFormate            String date   null          try               Calendar cal   Calendar getInstance TimeZone getTimeZone  UTC                 cal setTimeInMillis mTimestamp   1000L               date   DateFormat format mDateFormate  cal getTimeInMillis    toString                 SimpleDateFormat formatter   new SimpleDateFormat mDateFormate               formatter setTimeZone TimeZone getTimeZone  UTC                 Date value   formatter parse date                SimpleDateFormat dateFormatter   new SimpleDateFormat mDateFormate               dateFormatter setTimeZone TimeZone getDefault                 date   dateFormatter format value               return date            catch  Exception e                e printStackTrace                      return date          Result    12-08-2016 - 04 30 PM    Hope this will work for others

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Local to UTC  DateTime dateTimeNew   new DateTime date getTime    DateTimeZone forID  Asia Calcutta     SimpleDateFormat simpleDateFormat   new SimpleDateFormat  yyyy-MM-dd HH mm ss    simpleDateFormat setTimeZone TimeZone getTimeZone  UTC     String datetimeString   dateTimeNew toString  yyyy-MM-dd HH mm ss    long milis   0  try        milis   simpleDateFormat parse datetimeString  getTime      catch  ParseException e       e printStackTrace

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Converting a date String of the format  2011-06-23T15 11 32  to our time zone   private String getDate String ourDate        try               SimpleDateFormat formatter   new SimpleDateFormat  yyyy-MM-dd HH mm ss            formatter setTimeZone TimeZone getTimeZone  UTC             Date value   formatter parse ourDate            SimpleDateFormat dateFormatter   new SimpleDateFormat  MM-dd-yyyy HH mm      this format changeable         dateFormatter setTimeZone TimeZone getDefault             ourDate   dateFormatter format value              Log d  ourDate   ourDate             catch  Exception e                ourDate    00-00-0000 00 00           return ourDate

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It s Working  Call this method where you use   SntpClient client   new SntpClient    if  client requestTime  ntp ubuntu com   30000       long now   client getNtpTime      Date current   new Date now      date2   sdf parse new Date current getTime    toString         System out println current toString       Log e TAG   testing SntpClient time current toString     current toString       date2     date2                                                                import android os SystemClock  import android util Log   import java net DatagramPacket  import java net DatagramSocket  import java net InetAddress            hide        Simple SNTP client class for retrieving network time        Sample usage      lt pre gt SntpClient client   new SntpClient       if  client requestTime  time foo com             long now   client getNtpTime     SystemClock elapsedRealtime   - client getNtpTimeReference             lt  pre gt      public class SntpClient     private static final String TAG    SntpClient      private static final int REFERENCE TIME OFFSET   16    private static final int ORIGINATE TIME OFFSET   24    private static final int RECEIVE TIME OFFSET   32    private static final int TRANSMIT TIME OFFSET   40    private static final int NTP PACKET SIZE   48     private static final int NTP PORT   123    private static final int NTP MODE CLIENT   3    private static final int NTP VERSION   3        Number of seconds between Jan 1  1900 and Jan 1  1970      70 years plus 17 leap days   private static final long OFFSET 1900 TO 1970     365L   70L    17L    24L   60L   60L        system time computed from NTP server response   private long mNtpTime        value of SystemClock elapsedRealtime   corresponding to mNtpTime   private long mNtpTimeReference        round trip time in milliseconds   private long mRoundTripTime              Sends an SNTP request to the given host and processes the response             param host host name of the server        param timeout network timeout in milliseconds        return true if the transaction was successful          public boolean requestTime String host  int timeout        DatagramSocket socket   null      try         socket   new DatagramSocket          socket setSoTimeout timeout         InetAddress address   InetAddress getByName host         byte   buffer   new byte NTP PACKET SIZE         DatagramPacket request   new DatagramPacket buffer  buffer length  address  NTP PORT             set mode   3  client  and version   3          mode is in low 3 bits of first byte          version is in bits 3-5 of first byte       buffer 0    NTP MODE CLIENT    NTP VERSION  lt  lt  3             get current time and write it to the request packet       long requestTime   System currentTimeMillis          long requestTicks   SystemClock elapsedRealtime          writeTimeStamp buffer  TRANSMIT TIME OFFSET  requestTime          socket send request             read the response       DatagramPacket response   new DatagramPacket buffer  buffer length         socket receive response         long responseTicks   SystemClock elapsedRealtime          long responseTime   requestTime    responseTicks - requestTicks             extract the results       long originateTime   readTimeStamp buffer  ORIGINATE TIME OFFSET         long receiveTime   readTimeStamp buffer  RECEIVE TIME OFFSET         long transmitTime   readTimeStamp buffer  TRANSMIT TIME OFFSET         long roundTripTime   responseTicks - requestTicks -  transmitTime - receiveTime            receiveTime   originateTime   transit   skew          responseTime   transmitTime   transit - skew          clockOffset     receiveTime - originateTime     transmitTime - responseTime   2                          originateTime   transit   skew - originateTime                             transmitTime -  transmitTime   transit - skew    2                          transit   skew     transmitTime - transmitTime - transit   skew   2                         transit   skew - transit   skew  2                         2   skew  2   skew       long clockOffset     receiveTime - originateTime     transmitTime - responseTime   2           if  false  Log d TAG   round trip      roundTripTime     ms             if  false  Log d TAG   clock offset      clockOffset     ms              save our results - use the times on this side of the network latency           response rather than request time        mNtpTime   responseTime   clockOffset        mNtpTimeReference   responseTicks        mRoundTripTime   roundTripTime        catch  Exception e          if  false  Log d TAG   request time failed      e         return false        finally         if  socket    null            socket close                       return true                  Returns the time computed from the NTP transaction             return time value computed from NTP server response          public long getNtpTime         return mNtpTime                  Returns the reference clock value  value of SystemClock elapsedRealtime         corresponding to the NTP time             return reference clock corresponding to the NTP time          public long getNtpTimeReference         return mNtpTimeReference                  Returns the round trip time of the NTP transaction            return round trip time in milliseconds          public long getRoundTripTime         return mRoundTripTime                  Reads an unsigned 32 bit big endian number from the given offset in the buffer          private long read32 byte   buffer  int offset        byte b0   buffer offset       byte b1   buffer offset 1       byte b2   buffer offset 2       byte b3   buffer offset 3           convert signed bytes to unsigned values     int i0     b0  amp  0x80     0x80    b0  amp  0x7F    0x80   b0       int i1     b1  amp  0x80     0x80    b1  amp  0x7F    0x80   b1       int i2     b2  amp  0x80     0x80    b2  amp  0x7F    0x80   b2       int i3     b3  amp  0x80     0x80    b3  amp  0x7F    0x80   b3        return   long i0  lt  lt  24      long i1  lt  lt  16      long i2  lt  lt  8     long i3                  Reads the NTP time stamp at the given offset in the buffer and returns      it as a system time  milliseconds since January 1  1970           private long readTimeStamp byte   buffer  int offset        long seconds   read32 buffer  offset       long fraction   read32 buffer  offset   4       return   seconds - OFFSET 1900 TO 1970    1000      fraction   1000L    0x100000000L                   Writes system time  milliseconds since January 1  1970  as an NTP time stamp      at the given offset in the buffer          private void writeTimeStamp byte   buffer  int offset  long time        long seconds   time   1000L      long milliseconds   time - seconds   1000L      seconds    OFFSET 1900 TO 1970          write seconds in big endian format     buffer offset       byte  seconds  gt  gt  24       buffer offset       byte  seconds  gt  gt  16       buffer offset       byte  seconds  gt  gt  8       buffer offset       byte  seconds  gt  gt  0        long fraction   milliseconds   0x100000000L   1000L         write fraction in big endian format     buffer offset       byte  fraction  gt  gt  24       buffer offset       byte  fraction  gt  gt  16       buffer offset       byte  fraction  gt  gt  8          low order bits should be random data     buffer offset       byte  Math random     255 0

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The answer from  prgDevelop returns 0 on my Android Marsmallow  Must return 7200000  These changes make it work fine   int offset   TimeZone getTimeZone Time getCurrentTimezone    getRawOffset     TimeZone getTimeZone Time getCurrentTimezone    getDSTSavings

[android] How to convert UTC timestamp to device local time in android

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