MySQL:

MAKEDATE

Syntax:
MAKEDATE(year,dayofyear)

Returns a date, given year and day-of-year values. dayofyear must be
greater than 0 or the result is NULL.

Example

mysql> SELECT MAKEDATE(2011,31), MAKEDATE(2011,32);
-> '2011-01-31', '2011-02-01'
mysql> SELECT MAKEDATE(2011,365), MAKEDATE(2014,365);
-> '2011-12-31', '2014-12-31'
mysql> SELECT MAKEDATE(2011,0);
-> NULL

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