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Developer-C 11.1
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DECLARE @DATE DATETIME='29-JAN-2020' SELECT DATEADD(DAY, 2 - CASE WHEN DATEPART(WEEKDAY, @DATE-DAY(@DATE)+1)=1 THEN 8 ELSE DATEPART(WEEKDAY, @DATE-DAY(@DATE)+1) END, CAST( @DATE-DAY(@DATE)+1 AS DATE)) [MONTH_START_DATE], DATEADD(DAY, 8 - CASE WHEN DATEPART(WEEKDAY, EOMONTH(@DATE))=1 THEN 8 ELSE DATEPART(WEEKDAY, EOMONTH(@DATE)) END , CAST(EOMONTH(@DATE) AS DATE)) [MONTH_END_DATE];
MONTH_START_DATE
MONTH_END_DATE
30/12/2019 00:00:00
02/02/2020 00:00:00