F_LASTDAYLASTWEEK

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

Example

 SELECT '26.01.2019' AS ISCORRECT, F_LASTDAYLASTWEEK('01.02.2019 15:00:00') FROM RDB$DATABASE;

Expected results:

 ISCORRECT          F_LASTDAYLASTWEEK
 ========== =========================
 26.01.2019 2019-01-26 00:00:00.0000

Example

 SELECT '29.12.2018' AS ISCORRECT, F_LASTDAYLASTWEEK('02.01.2019 15:00:00') FROM RDB$DATABASE;

Expected results:

 ISCORRECT          F_LASTDAYLASTWEEK
 ========== =========================
 29.12.2018 2018-12-29 00:00:00.0000

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