T-Sql change month and day

I need to convert a datetime field to the 1st day of the next month.  My sql below
works to change the day or month but I want the month and day changed in one statement.     Thanks.

declare @newdate  datetime,
            @olddate  datetime
            set @olddate = '2015-05-10'    -- want this to  be '2015-06-01' as @newdate
            set @newdate = DATEADD(m,1,@olddate)             ---adds 1 to month
            set @newdate = dateadd(dd, -DAY(@olddate) + 1, @olddate)                      --sets day to 1
            select @olddate,
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dsackerContract ERP Admin/ConsultantCommented:
This should work:
DECLARE @newdate  datetime,
        @olddate  datetime

SET @olddate = '2015-05-10'
SET @newdate = CONVERT(varchar(7), DATEADD(m, 1, @olddate), 23) + '-01'

SELECT @olddate AS OldDate,
       @newdate AS NewDate

Open in new window

CONVERT(varchar(10), <any date>, 23) returns yyyy-mm-dd.

Since I gave it a varchar(7), it truncated the date to yyyy-mm.

Concatenating on the + '-01' changes it to the 1st day.

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