calculating time over several days

[lopezid1]

Hello, so I need help with a task that I am trying to set up. Im trying to calculate elapsed time on projects.

Example: I have start date 4/29/21 @ 12:22 pm END DATE 5/1/21 @ 9:21 AM

WORK HOURS MON- FRI ( EVERY OTHER SATURDAY) 7:00 AM - 3:45 PM

The formula I am using which I was able to get from here is:

=(networkdays(s,e)-1)*("15:45"-"7:00")+if(networkdays(e,e),median(mod(e,1),"15:45","7:00"),"15:45")-median(networkdays(s,s)*mod(s,1),"15:45","7:00")

but I would like to include every other Saturday . So how can I do that? Your help is greatly appreciated. thank you.

 

[jasonb75]

I would personally use NETWORKDAYS.INTL with a Sunday only weekend (option 11), then list the Saturdays that shouldn't be included as holidays.

 

[lopezid1]

I would personally use NETWORKDAYS.INTL with a Sunday only weekend (option 11), then list the Saturdays that shouldn't be included as holidays.

OK thank you, would you please be so kind as to give me an example using the networkdays.intl formula? Thank you so much for your help.

 

[jasonb75]

Using your formula as a reference it would be something like this, where h refers to a list of holidays, i.e. the Saturdays to be excluded.

=(networkdays.intl(s,e,11,h)-1)*("15:45"-"7:00")+if(networkdays.intl(e,e,11,h),median(mod(e,1),"15:45","7:00"),"15:45")-median(networkdays.intl(s,s,11,h)*mod(s,1),"15:45","7:00")

How you create the list of excluded Saturdays is down to preference. Personally, (with your version of excel) I would list them in a hidden sheet by entering the date of the earliest Saturday to exclude in A1, then entering =A1+14 into A2 and filling that down as far as A52 (enough to cover 2 years).
Others may do it with named ranges, or additional functions within the formula (less efficient, more complicated, and potential for errors if not done properly).