This post builds on earlier discussion, How many hours did Johnny work? I recommend you to read that post too.
Lets say you have 2 dates (with time) in cells A1 and A2 indicating starting and ending timestamps of an activity. And you want to calculate how many workings hours the task took. Further, lets assume,
- Start date is in A1 and End date is in A2
- Work day starts at 9 AM and ends at 6PM
- and weekends are holidays
Now, if you were to calculate total number of working hours between 2 given dates, the first step would be to understand the problem thru, lets say a diagram like this:
We would write a formula like this:
=(18/24-MOD(A1,1)+MOD(A2,1)-9/24)*24 + (NETWORKDAYS(A1,A2)-2)*9
See the above illustration to understand this formula.
Now, while this formula is not terribly long or ineffective, it does feel complicated.
May be we can solve the problem in a different way?!?
Michael left an interesting answer to my initial question, how many hours did Johnny work?
Pedro took the formula further with his comment.
The approach behind their formulas is simple and truly out of box.
Instead of calculating how many hours are worked, we try to calculate how many hours are not worked and then subtract this from the total working hours. Simple!
See this illustration:
So the formula becomes:
Total working hours between 2 dates – (hours not worked on starting day + hours not worked on ending day)
=NETWORKDAYS(A1,A2)*9 - (MOD(A1,1)-9/24 + 18/24 -MOD(A2,1))*24
After simplification, the formula becomes,
=NETWORKDAYS(A1,A2)*9 - (MOD(A1,1) -MOD(A2,1))*24 -9
=(NETWORKDAYS(A1,A2)-1)*9 +(MOD(A2,1)-MOD(A1,1))*24
Sixseven also posted an equally elegant formula that uses TIME function instead of MOD()
=(NETWORKDAYS(B3,C3)*9) - ((TIME(HOUR(B3),MINUTE(B3),SECOND(B3))-TIME(9,0,0))*24) - ((TIME(18,0,0)-TIME(HOUR(C3),MINUTE(C3),SECOND(C3)))*24)
Download the solution Workbook and play with it
Click here to download the solution workbook and use it to understand the formulas better.
Thanks to Pedro & Michael & Sixseven & All of you
If someone asks me what is the most valuable part of this site, I would proudly say, “the comments”. Every day, we get tens of insightful comments from around the world teaching us various important techniques, tricks and ideas.
Case in point: the comments by Michael, Pedro and Sixseven on the “how many hours…” post taught me how to think out of box to solve a tricky problem like this with an elegant, simple formula. Thank you very much Michael, Pedro, Sixseven and each and every one of you who comment. 🙂
Have a great weekend everyone.
PS: This weekend is my mom’s birthday, plus it is a minor festival in India. So I am going to eat sumptuously, party vigorously and relax carelessly. Next week is going to be big with launch of excel school 3.
PPS: While at it, you may want to sign up for excel school already. The free lesson offer will vanish on Wednesday.
29 Responses to “You are invited [personal]”
Dear Sir,
This is to just Wish the kids a Happy birthday in Advance.May Almighty bless them all strength,Success
Dear Chandoo,
My best wishes to your child.I had become regular visitor of your site and finally today it made me to post a comment...
Best wishes from my end! Dont think it would be possible to personally come .. but my best wishes would always be there!! 🙂
Chandoo, thank you for the kind invitation. I wish a special birthday day for your daughters, Nishanth & Nakshatra. Will you be serving "dudh pakh"?
-bill
What a kind thought to invite us!
I pray your family will be continually blessed.
Thank you very much for the invitation, how I wish Philippines is just a Jeepney ride away from India. Best wishes for your baby girls and more blessings to come.
Hi Chandoo,
Thanks for the invitation ! You treat everyone that comes to your site as part of your family community. Me and my family wishes Nishanth & Nakshatra a very very happy birthday !!
Though physically we cant be with you to celebrate the occasion, you know our blessing are with you !
To be a father is not easy, furthermore you have to be a father to 2 kids !
Francis
Dad of 2 and 9 year old.
Hi Chandoo,
It was very kind of you to invite us all along to the 'Extravaganza'. Like others that have commented here I too, am to far (Australia) to pop over for a piece of cake 🙂 Best wishes to you and your family on such a milestone.
Emma
(soon to be mum of 1!!!)
Dear Chandoo
God bless Nishanth & Nakshatra. Wishing you and your family a very enjoyable first birthday party.
(Father of a 9 month baby... wondering how you manage 2 !!! )
God bless the little ones. Have a blast.
Hi Chandoo
Happy birthday !
Indeed children are a blessing and make our lives much more deeper.
Wow! I wonder how that would look; all those Excel users partying with your cute kids!
Enjoy the festivities and remember; they grow up really fast.
Dear Chandoo,
Thanks for your invitation!
Please accept my wishes for Nishanth & Nakshatra, and a very very happy birthday to both of them.
(Father of a 1 year old baby)
Hi Chandoo,
Thanks for the invitation. Wishing Nishanth and Nakshatra a very happy birthday and God bless all of you!
Howdy Chandoo,
Gosh, would love to attend the birthday party for your little blessings but I live in Dallas, TX. The children are beautiful. Thank you so much for the Excel information, tips, hints, special formulas, etc., you and your children are really a blessing. I look forward to your e-mails and check your web site frequently. Regards, Lynn
Chandoo Garu,
Your kids look adorable. Congratulations. My Aashirwaadam to both of them.
Regards,
Kalyan Verma
@all: Thank you every one for the wishes, blessings and prayers. We are very excited and busy with the birthday preps now. I will share a pic or two when its over... 🙂
Wish you and your entire family all the blessings. May god provide your babies with all the love and charm in the entire universe.
Like Emma I am rather far away (South Africa), but best wishes to you and your family on this special occasion.
(Mother of 7 and grandmother of 5)
Dear Chandoo,
May God Bless your little ones with Good Health... Happy birthday to them from me... Wish i could be there but work doesn't permit me to travel 🙁
And thanks again for treating all of us like your family
Rajatha
Sir.
God bless the two little angels with all the happiness in the world.....
Wishing Nishanth and Nakshatra a very happy first birthday. My youngest has just turned 18, and I wish you and your family every happiness in the exciting journey ahead.
Hi Chandoo,
I'm reading your blog for more than a year now, and i'm very pleased by this invitation.
I wish a very special Happy Birthday to the 2 little ones from Mauritius Island.
If, for any reason, you are coming on the island in the future, feel free to drop me a mail.
Have a nice party, and a nice year to come with Nishanth and Nakshatra.
Happy birthday!
Your babies are beautiful!
This year is not possible for us to attend. My family will be there for your next family party.
Enjoy the cake and dinner
May God Bless your little ones with Good Health… Happy birthday to them from me....I am also the father my little daughter named akanksha, she is 2.5 yrs old,,,,but i am unemployed 2 yrs ,,i know when u become a dad u r many hopes.
Guru
My belated wishes for your kids... I feel sorry for having missed them to wish to the right time.... May almighty shower all his blessings on your family.....
With regards
Chandoo,
Congratulations. Please give you children a big Happy Birthday (one day late) from me. Enjoy, they grow up very fast
Gene
@all.. thanks for the wishes and blessings. We had a fantastic weekend with all the relatives, friends. Kids loved the cake, enjoyed the beach and had fun playing with gifts. Here are some photos..
Chandoo & family - greetings from Ireland, hope you enjoyed the day!