# calculating working hours between 2 dates

J

#### Jani Ruohomaa

Hi!

Does anyone know how to calculate working hours between 2 dates ?
The 2 examples I found on the Internet does not work
For example this one:

=IF(AND(INT(StartDT)=INT(EndDT),NOT(ISNA(MATCH(INT(StartDT),HolidayList,0))))
,0,ABS(IF(INT(StartDT)=INT(EndDT),ROUND(24*(EndDT-StartDT),2),
(24*(DayEnd-DayStart)*
(MAX(NETWORKDAYS(StartDT+1,EndDT-1,HolidayList),0)+
INT(24*(((EndDT-INT(EndDT))-
(StartDT-INT(StartDT)))+(DayEnd-DayStart))/(24*(DayEnd-DayStart))))+
MOD(ROUND(((24*(EndDT-INT(EndDT)))-24*DayStart)+
(24*DayEnd-(24*(StartDT-INT(StartDT)))),2),
ROUND((24*(DayEnd-DayStart)),2))))))

StartDT: 8.1.2008 05:00
EndDT: 8.1.2008 08:00

DayStart: 8:00
DayEnd: 16:00

gives as a result 3 hours (it should of course be 0)

Does anyone know how to fix it so that it calculates correctly ?

There is another solution for calculating the working hours between 2
dates but it has the same problem

Thanks,
Jani

M

#### Mike H

Jani,

Maybe this:-

=((NETWORKDAYS(A1,B1)-1)*(D\$2-D\$1)+IF(NETWORKDAYS(B1,B1),MEDIAN(MOD(B1,1),D\$2,D\$1),D\$2)-MEDIAN(NETWORKDAYS(A1,A1)*MOD(A1,1),D\$2,D\$1))*24

Where

A1 = Start date & Time
B1 = End Date/Time
D1 =day start time
D2 =Day end time

The formula can be dragged down for different start/end periods in columns A
& B.

Mike

M

#### Mike H

Jani,

I should add, format the result as a number with zero decimal places.

Mike

S

#### Stan Brown

Sat, 26 Jan 2008 11:45:20 +0200 from Jani Ruohomaa
Does anyone know how to calculate working hours between 2 dates ?

Look in Help for NETWORKDAYS, and multiply by the number of working
hours per workday.

You will need Analysis Toolpak if it's not already installed.

J

#### Jani Ruohomaa

Mike H kirjoitti:
Jani,

I should add, format the result as a number with zero decimal places.

Mike
Thanks a million, it seems to work!

J

#### Jani Ruohomaa

Hi!

It seems that it gives as a result for these to dates 16 hours but it
should be 0 since 12th and 13th are saturday and sunday and non-working days

start date 12.1.2008 08:00
end date 13.1.2008 08:00

If I put

start date as 11.1.2008 08:00

and end date as 12.1.2008 08:00 or 13.1.2008 08:00 it is correct, 8 hours
11th is a friday and a working day

Jani

Mike H kirjoitti:

M

#### Mike H

Hi,

On my computer it gives a result of 0 for those dates/times which is correct
because as you point out they are a saturday and sunday
If I extend the dates to
12/01/2008 08:00 14/01/2008 08:00
This also returns (correctly) 0 and
12/01/2008 08:00 14/01/2008 16:00
Returns 8

I can't explain the erronoeous results you are getting, the formula is
correct.

Mike