Calculating Target Date/Time Based on Start date and hours - Excel 2007

Post a sample sheet in this thread showing the problem.

Unfortunately the attachment icon doesn't work at the moment. So, to attach an Excel file you have to do the following: Just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.

Depending on the chosen start time/duration, Excels way of counting (floating point arithmetic) can sometimes give rise to errors. A start time of 14:00 and a duration of 4 hrs is one. 11:00 and 1 hr is another.

Other combinatons, as you pointed out (start time of 12:00 and 6 hrs duration) work fine. To fix this, some additional rounding phrases need to be added to the formula:

=WORKDAY(A2,CEILING(ROUND(1440*(B2/24+MOD(A2,1)-E$2)/(F$2-E$2),0)/1440,1)-1)+ROUND(1440*(MOD(A2,1)+B2/24),0)/1440-CEILING(ROUND(1440*(MOD(A2,1)+(B2/24-E$2)),0)/1440,ROUND(1440*(F$2-E$2),0)/1440)+F$2-E$2

see sheet.

I did leave them out... as your attachment referred to blank cells.

=WORKDAY(A2,CEILING(ROUND(1440*(B2/24+MOD(A2,1)-E$2)/(F$2-E$2),0)/1440,1)-1,$D$2:$D$10)+ROUND(1440*(MOD(A2,1)+B2/24),0)/1440-CEILING(ROUND(1440*(MOD(A2,1)+(B2/24-E$2)),0)/1440,ROUND(1440*(F$2-E$2),0)/1440)+F$2-E$2

will do it.

So... You're welcome.

---

If that takes care of your original question, please select "Thread Tools" from the menu link above and mark this thread as SOLVED.

It'd also be appreciated if you were to click the Add Reputation button at the foot of any of the posts of all members who helped you reach a solution.

You're welcome and thanks for the rep.