DateDiff calculation

I am trying to get an efficiency figure calculation from a start time less a
finish time less the sum of personal breaks and m/c breaks.

Start time = Tin
Finish Time = TOut
start -less finish Time = workedT
personal breaks = Pbreak
Machine downtime = M/C break

I have managed to calculate the WorkedT by using the datediff function,
DateDiff("n",[TIn],[TOut])\60 & Format(DateDiff("n",[TIn],[TOut]) Mod
60,"\:00") this is now my workedT,

However i now need to subtract the sum of [Pbreak]+[M/C Break] from my
[worked time] and my answer needs to be in Minutes.

Can anyone help.

Try:
DateDiff("n", [Tin], [TOut]) - Nz([Pbreak],0) - Nz([m/c break],0)

This assumes yoru field types a
- Tin Date/Time
- TOut Date/Time
- Pbreak Number (in minutes)
- m/c break Number (in minutes)

If you must Format the result, do so only at the end of the calculation.
Format() generates a string (text), which may not handle further
calculations the way you expect.

--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.

"snowball" wrote in message
...
I am trying to get an efficiency figure calculation from a start time less
a
finish time less the sum of personal breaks and m/c breaks.

Start time = Tin
Finish Time = TOut
start -less finish Time = workedT
personal breaks = Pbreak
Machine downtime = M/C break

I have managed to calculate the WorkedT by using the datediff function,
DateDiff("n",[TIn],[TOut])\60 & Format(DateDiff("n",[TIn],[TOut]) Mod
60,"\:00") this is now my workedT,

However i now need to subtract the sum of [Pbreak]+[M/C Break] from my
[worked time] and my answer needs to be in Minutes.

Can anyone help.

Thanks that helped

"Allen Browne" wrote:

Try:
DateDiff("n", [Tin], [TOut]) - Nz([Pbreak],0) - Nz([m/c break],0)

This assumes yoru field types a
- Tin Date/Time
- TOut Date/Time
- Pbreak Number (in minutes)
- m/c break Number (in minutes)

If you must Format the result, do so only at the end of the calculation.
Format() generates a string (text), which may not handle further
calculations the way you expect.

--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.

"snowball" wrote in message
...
I am trying to get an efficiency figure calculation from a start time less
a
finish time less the sum of personal breaks and m/c breaks.

Start time = Tin
Finish Time = TOut
start -less finish Time = workedT
personal breaks = Pbreak
Machine downtime = M/C break

I have managed to calculate the WorkedT by using the datediff function,
DateDiff("n",[TIn],[TOut])\60 & Format(DateDiff("n",[TIn],[TOut]) Mod
60,"\:00") this is now my workedT,

However i now need to subtract the sum of [Pbreak]+[M/C Break] from my
[worked time] and my answer needs to be in Minutes.

Can anyone help.