sql - Oracle next_day function returns wrong date -


i running oracle database 11g express edition. when issue:

select next_day('04-jun-15', 'friday') dual;

i getting correct result '05-jun-15'.
when issuing: 

select next_day(date '15-06-04', 'friday') dual;

i getting pretty strange result '07-jun-15'.
@ same time both dates looks same me: 

select to_char(date '15-06-04', 'dd-mm-rr hh24:mi:ss'),          to_char(to_date('04-jun-15'), 'dd-mm-rr hh24:mi:ss')          dual;

both return '04-06-15 00:00:00'.
can explain why works in way?

thanks!

next_day(date '15-06-04', 'friday')

you reinvented y2k bug. year should yyyy format in complete 4 digits. or, use rr format along to_date. there rules rr format need take care.

the ansi date literal contains no time portion, , must specified in format ('yyyy-mm-dd').

make correction , correct result:

ansi date literal

sql> select next_day(date '2015-06-04', 'friday') dual;  next_day( --------- 05-jun-15  sql>

to_date rr format

sql> select next_day(to_date('15-06-04', 'rr-mm-dd'), 'friday') dual;  next_day( --------- 05-jun-15  sql>

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