Unix epoch time to Java Date object

Question

I have a string containing the UNIX Epoch time  and I need to convert it to a Java Date object   String date    1081157732   DateFormat df   new SimpleDateFormat         This line try     Date expiry   df parse date      catch  ParseException ex      ex getStackTrace        The marked line is where I m having trouble  I can t work out what the argument to SimpleDateFormat   should be  or even if I should be using SimpleDateFormat

User · Accepted Answer

How about just   Date expiry   new Date Long parseLong date      EDIT  as per rde6173 s answer and taking a closer look at the input specified in the question    1081157732  appears to be a seconds-based epoch value so you d want to multiply the long from parseLong   by 1000 to convert to milliseconds  which is what Java s Date constructor uses  so   Date expiry   new Date Long parseLong date    1000

User · Answer

Epoch is the number of seconds since Jan 1  1970     So   String epochString    1081157732   long epoch   Long parseLong  epochString    Date expiry   new Date  epoch   1000      For more information  http   www epochconverter com

User · Answer

Hum     if I am not mistaken  the UNIX Epoch time is actually the same thing as   System currentTimeMillis     So writing  try       Date expiry   new Date Long parseLong date      catch NumberFormatException e                   should work  and be much faster that date parsing

User · Answer

java time Using the java time framework built into Java 8 and later  import java time LocalDateTime  import java time Instant  import java time ZoneId   long epoch   Long parseLong  quot 1081157732 quot    Instant instant   Instant ofEpochSecond epoch   ZonedDateTime ofInstant instant  ZoneOffset UTC     ZonedDateTime   2004-04-05T09 35 32Z UTC   In this case you should better use ZonedDateTime to mark it as date in UTC time zone because Epoch is defined in UTC in Unix time used by Java  ZoneOffset contains a handy constant for the UTC time zone  as seen in last line above  Its superclass  ZoneId can be used to adjust into other time zones  ZoneId zoneId   ZoneId of   quot America Montreal quot

User · Answer

To convert seconds time stamp to millisecond time stamp  You could use the TimeUnit API and neat like this   long milliSecondTimeStamp   MILLISECONDS convert secondsTimeStamp  SECONDS

User · Answer

Better yet  use JodaTime  Much easier to parse strings and into strings  Is thread safe as well  Worth the time it will take you to implement it

User · Answer

long timestamp   Long parseLong date  Date expiry   new Date timestamp   1000

[java] Unix epoch time to Java Date object

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