Comparing different times Data in same table

Here is a column expression that gets that result.  I called the table "Change" so replace that with your actual table name.

Change From Previous =
VAR vThisDate = Change[Date]
VAR vPrevDate =
    CALCULATE (
        MAX ( Change[Date] ),
        ALLEXCEPT (
            Change,
            Change[ Column1]
        ),
        Change[Date] < vThisDate
    )
VAR vCurrent = Change[Column2]
VAR vPrevValue =
    CALCULATE (
        MIN ( Change[Column2] ),
        ALLEXCEPT (
            Change,
            Change[ Column1]
        ),
        Change[Date] = vPrevDate
    )
RETURN
    IF (
        OR (
            ISBLANK ( vPrevDate ),
            vCurrent = vPrevValue
        ),
        0,
        1
    )

Pat