how to get year ago data when there is leap year

[smeg]

Hi I have a measure to calculate yearago data,but how can this be  rewritten to handle  leap year?

$YAgo:=CALCULATE(SUM(Metrics_Table[$]),DATEADD(Dates_Table[Anchor_Date],-364,DAY))  -- this is hardcoded formula how can this be dynamic to handle leap year?

Thanks..

[ThxAlot]

$YAgo :=
CALCULATE(
    SUM( Metrics_Table[$] ),
    DATEADD( Dates_Table[Anchor_Date], -1, YEAR )
)

[smeg]

I already have that formula ,my question is how to handle leap year and made it dynamic?