# time calc

#### Trevor3007

##### Well-known Member
Hi,

I need some help regarding time start / end calc.

I use this formula
=SUM(E28-F28)-H28

I have to input these times using the 24hr clock and allow for a 00:30 minute break . So when I enter :
(cell e28)Start time = 18:00
(cell f28)End time = 02:00
(cell h28) Break time = 00:30
In the the 'hours worked (cell c28) it should display '7:30'( which takes into account minus the 00:30min break), but instead returns 15:30? Can someone please show me what is required to give the correct result?

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#### arthurbr

##### Well-known Member
The SUM function you are using is redundant
Try
Excel Formula:
``=MOD(F28-E28,1)-H28``

#### Trevor3007

##### Well-known Member
Thank you Arthurbr !

The SUM function you are using is redundant- did not even know this & have used =sum for like ever. Cheers for the tip.

Yeah that works, but , I have to total ( cell c28)l up the hours worked & using the formula =SUM(C28:C34) , it should read 37.5 but instead it displays 10:30.

Also is it possible to add in the start time (18:00)so the end would automatically add 8rs & return (02:00)

.kind regards

#### arthurbr

##### Well-known Member
I don't see the link between the decimal value 37.5 and 10:30
You can format the total as a number like
Excel Formula:
``=sum(c28:c34)*24``
or as time. As it seems that the total time is more than 24 hrs you have to total as you did
Excel Formula:
``=sum(c28:c34)``
and use a custom format like [h]:mm

#### arthurbr

##### Well-known Member

Also is it possible to add in the start time (18:00)so the end would automatically add 8rs & return (02:00)
I don't understand this requirement

#### Trevor3007

##### Well-known Member
evening arthurbr,

thanks for getting back to me & apologies for my delay getting back to you.

Will do my best to explain.

I am trying to minimise the amount of input required . So just by putting in the start time (in this case 18:00) the end time would populate & add 8 hours = 02:00 ( start time = 18:00 + 8) = end time 02:00 .

Hope i've explained this more clearly? Thanks again.

#### arthurbr

##### Well-known Member
Like
Excel Formula:
``=E28+8/24``
?

#### rhombus4

##### Well-known Member
Hi,

I need some help regarding time start / end calc.

I use this formula
=SUM(E28-F28)-H28

I have to input these times using the 24hr clock and allow for a 00:30 minute break . So when I enter :
(cell e28)Start time = 18:00
(cell f28)End time = 02:00
(cell h28) Break time = 00:30
In the the 'hours worked (cell c28) it should display '7:30'( which takes into account minus the 00:30min break), but instead returns 15:30? Can someone please show me what is required to give the correct result?

You get 15:30 because the start and end time are the wrong way round
E28-F28 - h28 is 18 - 2 - 0.5 hence 15.5
Should be
F28 - E28 - h28 is 0200 - 1800 (8) - 0.5 is 7 1/2

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