Ignore date filter/slicer when grabbing value for earliest date

[greenskmachine]

Hi there,

I have a simple dax expression that grabs a value (weight) as per the earlierst date:

EarliestWeight = 
CALCULATE(
    SUM(SourceTable[Weight]),
    FILTER(SourceTable,SourceTable[Date] = MIN(SourceTable[Date])))

 
I want to create another expression that ignores any filtering on the date slicer, so I get the abosulte minimum date no matter the date filters.

I can't seem to work it out. Help much appreciated.

[wdx223_Daniel]

EarliestWeight = VAR _minDate=MINX(ALL(SourceTable),SourceTable[Date]) RETURN 
CALCULATE(
    SUM(SourceTable[Weight]),
    FILTER(SourceTable,SourceTable[Date] = _minDate))

[greenskmachine]

Thanks, but for some reason it seems to only return a blank.