sql statement minus datetime

My office start time at 8.00 am (monday-friday)   9.00 on Satuarday how can I calculate minute that staff come late

fieldA(datetime)- 8.00 am  on  (monday-friday)
fiedA(datetime) -9.00 am on Sunday
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assuming you want number of minutes, try this
    , case
          when weekday(fielda) < 5 then 
                HOUR(timediff(time(fielda),'08:00:00')) * 60 +
          when weekday(fielda) = 5 then
                HOUR(timediff(time(fielda),'09:00:00')) * 60 +
                null /* what do yo do for a Sunday? */
      end as mins_diff
from table1

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MySQL Server

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