Rank based on datetime

Anonymous try this measure

Rank = 
VAR __countFlag = 
    CALCULATE ( 
        COUNTROWS ( 'Rank' ), 
        ALLEXCEPT ( 'Rank', 'Rank'[AgentID], 'Rank'[DateTime] ) 
    ) 
VAR __rank = 
    RANKX ( 
        ALLEXCEPT ( 'Rank', 'Rank'[AgentID] ), 
        CALCULATE ( MIN ( 'Rank'[DateTime] ) ), , 
        DESC, DENSE 
    )
RETURN  
IF ( 
    __countFlag > 1 && MAX ( 'Rank'[AgentStatus] ) = "On Call", 0, 
    __rank - IF ( __countFlag = 1, 1, 0 ) 
)

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