Second filter that would be between month beginning and ending

I have the following code, which sums up all my fees for my clients.

SumAmtVar = SUMX ( FILTER ( _billings, _billings[_tsg_clientid_value] = accounts[accountid] ), __billings[Amount] )

What I am needing is an additional filter that filters my transaction dates for the current month or a hard coded date range. What would the second filter look like? Any help or assistance is greatly appreciated.