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F_FIRSTDAYWEEK

• function from adhoc
• Compatible with UTF-8
• Input TIMESTAMP date optionally time
• Output TIMESTAMP Date with 1st day of (US) weekday (Sunday) as date with time 00:00:00

Example

 SELECT '30.12.2018' AS ISCORRECT, F_FIRSTDAYWEEK('03.01.2019 15:00:00') FROM RDB$DATABASE;

Expected results:

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

Example

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

Expected results:

 ISCORRECT            F_FIRSTDAYWEEK
 ========= =========================
 <null>                       <null>

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