C#
int year = DateTime.Now.Year;
int month = DateTime.Now.Month;
DateTime firstDayOfThisMonth
= new DateTime(year, month, 1);SQL
DECLARE @NOW DATETIME
DECLARE @FistDayOfThisMonth DATETIME
DECLARE @LastDayOfThisMonth DATETIME SET @NOW = GETDATE()
SET @FistDayOfThisMonth = @NOW - DAY(@NOW) + 1
SET @LastDayOfThisMonth = DATEADD(MONTH, 1, @NOW - DAY(@NOW) + 1) - 1SELECT @FistDayOfThisMonth
SELECT @LastDayOfThisMonth
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