How to subtract 30 days from the current date using SQL Server

You can convert it to datetime, and then use DATEADD(DAY, -30, date).

See here.

edit

I suspect many people are finding this question because they want to substract from current date (as is the title of the question, but not what OP intended). The comment of munyul below answers that question more specifically. Since comments are considered ethereal (may be deleted at any given point), I’ll repeat it here:

DATEADD(DAY, -30, GETDATE())

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