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F_FIRSTDAYWOY

• function from adhoc
• Compatible with UTF-8
• Input INTEGER week number, INTEGER year
• Output TIMESTAMP Date with 1st day of (US)week of the year as date with time 00:00:00

Example

 SELECT '30.12.2018' AS ISCORRECT, F_FIRSTDAYWOY(1, 2019) FROM RDB$DATABASE;

Expected results:

 ISCORRECT              F_FIRSTDAYWOY
 ========== =========================
 30.12.2018 2018-12-30 00:00:00.0000

Example

 SELECT NULL AS ISCORRECT, F_FIRSTDAYWOY(NULL, NULL) FROM RDB$DATABASE;

Expected results:

 ISCORRECT             F_FIRSTDAYWOY
 ========= =========================
 <null>                       <null>

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