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Convert UNIX Epoch Date to Oracle Display Value

Oracle Database Tips by Donald BurlesonJune 5, 2015

Question:  My company uses a product that stores date/time as an integer. I use a formula to convert it to a readable date.  I then need a function to convert the UNIX Epoch date format into an Oracle display date format.

Answer:  Oracle has several method for converting an epoch date format into a displayable Oracle date, and it depends on if you wish to keep timezone values:

select to_timestamp_tz('1970-01-01 Europe/London', 'yyyy-mm-dd tzr')+ numtodsinterval(1241132400000/1000,'second') dstamp
from dual;

You can also adjust epoch date conversion with the  dbtimezone and sessiontimezone variables, as well as current_timestamp and and time_zone variables:

alter database set_time_zone = 'Europe/London';
select current_timestamp from dual;

You can also adjust an Epoch date for daylight saving time adjustment. 

For UNIX epoch date conversion examples, see MOSC note 340512.1   Try this example to convert a UNIX epoch date to a display value with timestamp details:

select 'UTC' tz, (cast((to_timestamp('01-02-2009 01:00:00','dd-mm-yyyy hh24:mi:ss')) at time zone 'UTC' as date)
      - to_date('01-jan-1970','dd-mon-yyyy')) * (86400) * 1000 unix_time
from dual
union all
select 'GB' tz, (cast((to_timestamp('01-02-2009 01:00:00','dd-mm-yyyy hh24:mi:ss')) at time zone 'GB' as date)
      - to_date('01-jan-1970','dd-mon-yyyy')) * (86400) * 1000 unix_time from dual
union all
select 'Etc/GMT+1' tz, (cast((to_timestamp('01-02-2009 01:00:00','dd-mm-yyyy hh24:mi:ss')) at time zone 'Etc/GMT+1' as date)
      - to_date('01-jan-1970','dd-mon-yyyy')) * (86400) * 1000 unix_time
from dual;

You can also create a function to convert an epoch date to a display value:

create function epoch_to_date( p_epoch in number)
   return date
is
begin
   return to_date('1970-01-01', 'YYYY-MM-DD') + (p_epoch/ 86400000); end

 
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