Output SQL Timestamp to show only partial data [duplicate] - sql

Question

This question already has answers here:
Calculate difference between 2 date / times in Oracle SQL
(21 answers)
Closed 9 years ago.
I have 2 dates with following format:
ST_DT = Sun Dec 29 11:55:29 EST 2013
ED_DT = Tue Dec 30 20:21:34 EST 2013
I want to find the difference between these 2 dates in HH:MM:SS format. Now my problem is that i don't know how to parse the above date format in Oracle.

Answer 1

Are the dates in varchar2 type? Then, you can first convert it into timestamp format. Since it has timezone also, use the to_timestamp_tz function.
SQL> select to_timestamp_tz('Sun Dec 29 11:55:29 EST 2013','Dy Mon dd hh24:mi:ss TZR yyyy') from dual;
TO_TIMESTAMP_TZ('SUNDEC2911:55:29EST2013','DYMONDDHH24:MI:SSTZRYYYY')
---------------------------------------------------------------------------
29-DEC-13 11.55.29.000000000 AM EST
Once the dates are in timestamp type, subtracting them will give you the difference in interval day to second type.
SQL> select to_timestamp_tz ('Mon Dec 30 20:21:34 EST 2013','Dy Mon dd hh24:mi:ss TZR yyyy')
2 - to_timestamp_tz ('Sun Dec 29 11:55:29 EST 2013','Dy Mon dd hh24:mi:ss TZR yyyy') from dual;
TO_TIMESTAMP_TZ('MONDEC3020:21:34EST2013','DYMONDDHH24:MI:SSTZRYYYY')-TO_TI
---------------------------------------------------------------------------
+000000001 08:26:05.000000000
Then use extract to get the individual components from the interval.
SQL> select extract(day from intrvl) as dd,
2 extract(hour from intrvl) as hh24,
3 extract(minute from intrvl) as mi,
4 extract(second from intrvl) as ss
5 from (
6 select to_timestamp_tz ('Mon Dec 30 20:21:34 EST 2013','Dy Mon dd hh24:mi:ss TZR yyyy')
7 - to_timestamp_tz ('Sun Dec 29 11:55:29 EST 2013','Dy Mon dd hh24:mi:ss TZR yyyy') as intrvl
8 from dual
9 );
DD HH24 MI SS
---------- ---------- ---------- ----------
1 8 26 5

Answer 2

I figured out one solution but it will work only for same time zone dates.
with tab as (
select to_date(replace(substr('Sun Dec 28 23:59:59 EST 2013', 4), 'EST '), 'Mon DD HH24:MI:SS RRRR') start_date,
to_date(replace(substr('Tue Dec 30 20:21:34 EST 2013', 4), 'EST '), 'Mon DD HH24:MI:SS RRRR') end_date
from dual),
tab_sec as
(select ((end_date - start_date) * 24 * 60 * 60) sec from tab)
select lpad(trunc(sec / (60*60)), 2, '0')||':'||
lpad(trunc((sec - (trunc(sec / (60*60)) * 60 * 60))/60), 2, '0')||':'||
lpad(mod(sec, 60), 2, '0') diff
from tab_sec;

Answer 3

You can use NUMTODSINTERVAL
For example
with x as (
select to_date('01/01/2014 10:00:00','dd/mm/yyyy hh24:mi:ss') d1 ,
to_date('01/01/2014 12:00:00','dd/mm/yyyy hh24:mi:ss') d2
from dual
union all
select to_date('02/01/2014 10:00:00','dd/mm/yyyy hh24:mi:ss') d1 ,
to_date('01/01/2014 12:00:00','dd/mm/yyyy hh24:mi:ss') d2
from dual
union all
select to_date('01/01/2014 10:30:00','dd/mm/yyyy hh24:mi:ss') d1 ,
to_date('01/01/2014 12:00:00','dd/mm/yyyy hh24:mi:ss') d2
from dual
union all
select to_date('01/01/2014 10:00:30','dd/mm/yyyy hh24:mi:ss') d1 ,
to_date('01/01/2014 12:00:00','dd/mm/yyyy hh24:mi:ss') d2
from dual
union all
select to_date('01/01/2014 10:00:30','dd/mm/yyyy hh24:mi:ss') d1 ,
to_date('02/01/2014 12:20:10','dd/mm/yyyy hh24:mi:ss') d2
from dual
)
select d1 , d2 , numtodsinterval(d2 - d1, 'day') as interval_diff
from x
D1 D2 INTERVAL_DIFF
------------------- ------------------- ---------------------------------
01/01/2014 10:00:00 01/01/2014 12:00:00 +000000000 02:00:00.000000000
02/01/2014 10:00:00 01/01/2014 12:00:00 -000000000 22:00:00.000000000
01/01/2014 10:30:00 01/01/2014 12:00:00 +000000000 01:30:00.000000000
01/01/2014 10:00:30 01/01/2014 12:00:00 +000000000 01:59:30.000000000
01/01/2014 10:00:30 02/01/2014 12:20:10 +000000001 02:19:39.999999999