将3位数的输入转换为日期格式

Question

Even though the business requirement states the input as a "julian" date, it is actually a 3 digit number being passed to the Oracle stored procedure. For example, if the input is '001' then I need to convert it to January1 of the current year or if it is 010 convert it to January 10 of the current year etc. How would i do that taking into consideration leap years too? Please suggest. Thank you for your time.

Answer 1

if the three digit number represents the day of the year you could simply use the to_date function with DDD , which represents a three digit number which is the day of the year.

select to_char(to_date(310, 'DDD'),'DD.MM.YYYY') from dual; -- 05.11.2016
select to_char(to_date(001, 'DDD'),'DD.MM.YYYY') from dual; -- 01.01.2016
select to_char(to_date(010, 'DDD'),'DD.MM.YYYY') from dual; -- 10.01.2016
select to_char(to_date(060, 'DDD'),'DD.MM.YYYY') from dual; -- 29.02.2016

Answer 2

you can try this approach.

select to_char(trunc(sysdate, 'YY') + 060 - 1, 'DD/MM/YYYY') as day from dual;

29/02/2016

select to_char(trunc(sysdate, 'YY') + 010 - 1, 'DD/MM/YYYY') as day from dual;

10/01/2016