oracle convert unix epoch time to date

Question

The context is that there is an existing application in our product which generates and sends the EPOCH number to an existing oracle procedure & vice versa. It works in that procedure using something like this

SELECT UTC_TO_DATE (1463533832) FROM DUAL
SELECT date_to_utc(creation_date) FROM mytable

When I tried these queries it does work for me as well with Oracle 10g server (and oracle sql developer 4.x if that matters).

In the existing procedure the requirement was to save the value as date itself (time component was irrelevant), however in the new requirement I have to convert unix EPOCH value to datetime (at the hours/mins/seconds level, or better in a specific format such as dd-MMM-yyyy hh:mm:ss) in an oracle query. Strangely I am unable to find any documentation around the UTC_TO_DATE and DATE_TO_UTC functions with Google. I have looked around at all different questions on stackoverflow, but most of them are specific to programming languages such as php, java etc.

Bottom line, how to convert EPOCH to that level of time using these functions (or any other functions) in Oracle query? Additionally are those functions I am referring could be custom or specific somewhere, as I don't see any documentation or reference to this.

Answer 1

To convert from milliseconds from epoch (assume epoch is Jan 1st 1970):

select to_date('19700101', 'YYYYMMDD') + ( 1 / 24 / 60 / 60 / 1000) * 1322629200000
from dual;

11/30/2011 5:00:00 AM

To convert that date back to milliseconds:

select (to_date('11/30/2011 05:00:00', 'MM/DD/YYYY HH24:MI:SS') - to_date('19700101', 'YYYYMMDD')) * 24 * 60 * 60 * 1000
from dual;

1322629200000

If its seconds instead of milliseconds, just omit the 1000 part of the equation:

select to_date('19700101', 'YYYYMMDD') + ( 1 / 24 / 60 / 60 ) * 1322629200
from dual;

select (to_date('11/30/2011 05:00:00', 'MM/DD/YYYY HH24:MI:SS') - to_date('19700101', 'YYYYMMDD')) * 24 * 60 * 60
from dual;

Hope that helps.

Answer 2

Another option is to use an interval type:

SELECT TO_TIMESTAMP('1970-01-01 00:00:00.0'
                   ,'YYYY-MM-DD HH24:MI:SS.FF'
       ) + NUMTODSINTERVAL(1493963084212/1000, 'SECOND')
FROM dual;

It has this advantage that milliseconds won't be cut.

Answer 3

I thought somebody would be interested in seeing an Oracle function version of this:

CREATE OR REPLACE FUNCTION unix_to_date(unix_sec NUMBER)
RETURN date
IS
ret_date DATE;
BEGIN
    ret_date:=TO_DATE('19700101','YYYYMMDD')+( 1/ 24/ 60/ 60)*unix_sec;
    RETURN ret_date;
END;
/

I had a bunch of records I needed dates for so I updated my table with:

update bobfirst set entered=unix_to_date(1500000000+a);

where a is a number between 1 and 10,000,000.

Answer 4

If your epoch time is stored as an integer..... And you desire the conversion to Oracle date format.

Step 1--> Add your epoch date (1462086000) to standard 01-jan-1970. 86400 is seconds in a 24 hour period.

*Select TO_DATE('01-jan-1970',   'dd-mon-yyyy') + 1462086000/86400 from dual*  
   **output is 5/1/2016 7:00:00 AM**

Step 2--> Convert it to a CHAR . This is needed for formatting before additional functions can be applied.

  *Select TO_CHAR(TO_DATE('01-jan-1970',   'dd-mon-yyyy') + 1462086000/86400 ,'yyyy-mm-dd hh24:mi:ss') from dual*

   output is  2016-05-01 07:00:00

Step 3--> Now onto Timestamp conversion

Select to_timestamp(TO_CHAR(TO_DATE('01-jan-1970',   'dd-mon-yyyy') + 1462086000/86400 ,'yyyy-mm-dd hh24:mi:ss'), 'yyyy-mm-dd hh24:mi:ss') from dual

  output is 5/1/2016 7:00:00.000000000 AM

Step 4--> Now need the TimeZone, usage of UTC

Select from_tz(to_timestamp(TO_CHAR(TO_DATE('01-jan-1970',   'dd-mon-yyyy') + 1462086000/86400 ,'yyyy-mm-dd hh24:mi:ss'), 'yyyy-mm-dd hh24:mi:ss'),'UTC')  from dual

     output is 5/1/2016 7:00:00.000000000 AM +00:00

Step 5--> If your timezone need is PST

 Select from_tz(to_timestamp(TO_CHAR(TO_DATE('01-jan-1970',   'dd-mon-yyyy') + 1462086000/86400 ,'yyyy-mm-dd hh24:mi:ss'), 'yyyy-mm-dd hh24:mi:ss'),'UTC')  at time zone 'America/Los_Angeles' TZ from dual

           output is 5/1/2016 12:00:00.000000000 AM -07:00

Step 6--> Format the PST Timezone timestamp.

 Select to_Char(from_tz(to_timestamp(TO_CHAR(TO_DATE('01-jan-1970',   'dd-mon-yyyy') + 1462086000/86400 ,'yyyy-mm-dd hh24:mi:ss'), 'yyyy-mm-dd hh24:mi:ss'),'UTC')  at time zone 'America/Los_Angeles' ,'DD-MON-YYYY HH24:MI:SS') TZ from dual 

          output is  01-MAY-2016 00:00:00

Step 7--> And finally, if your column is date datatype

   Add to_DATE to the whole above Select. 

Answer 5

Here it is for both UTC/GMT and EST;

GMT  select (to_date('1970-01-01 00','yyyy-mm-dd hh24') +
     (1519232926891)/1000/60/60/24) from dual;

EST  select new_time(to_date('1970-01-01 00','yyyy-mm-dd hh24') + 
     (1519232926891)/1000/60/60/24, 'GMT', 'EST') from dual;