DateTime Logic for SWQL

Trying to query for everything last month. This bit works great in SQL...what is the equivalent in SWQL?

DateTime BETWEEN DATEADD(MONTH,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE()),0)) AND DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE()),0))

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