how to get different value between hour

hi rohazi 

try to add a column like this:

Diff2 = 
VAR _time = [Time]
VAR _date = [Date]
VAR _table =
FILTER(TableName, TableName[Date] = _date)
VAR _maxtime =
MINX(
    FILTER(
       _table,
        TableName[Time] > _time
    ),
    TableName[Time]
)
VAR _totalpre=
MAXX(
    FILTER(
       _table,
        TableName[Time] =_maxtime
    ),
    TableName[total]
)
RETURN
[Total] - _totalpre

it worked like this: