Week Numbers between a Start and End Date

[Susan Authers]

Hi All

I dont know if anyone can help!! a concept that sounds simple in my head is just not coming into fruition when im trying to do it in Excel.

I am trying to find a formula that will calculate the week number of a certain date that will fall between a start and date. So for example if my start date is 25/04/2018 and an end date of 20/07/2018 this will be 13 weeks (Monday to Friday)  , but if i want to know what week number the 13th June would fall on is there formula that can do this?

So far i have managed to use a formula where i physically just need to look where the start date falls between a Week start and week end by using the roll back to the previous Monday from the start date but the snag is when I enter a date that falls on a Monday i do not want it to roll back to the previous monday as this Monday would count as week one ?? 

if i am going about this all wrong or if there's an easier way i would be grateful for some advice 

[#2]

If you want to return the week number of a particular date then use function of WEEKNUM
A1 having the date use the formula below
=WEEKNUM(A1)

[#3]

Or

=ISOWEEKNUM(A1)

if you are in this system

[#4]

Hi Jamil 

thank your for your response, will this give me the week number which relates to the year i.e Jan to Dec? 

I am looking for i.e Start Date 18/12/17  End Date 09/03/2018    but 20/02/2018 would be week 11 ?  

[#5 · Accepted solution]

Hi Susan,

If you'd like to calculate number of full weeks from Start Date that could be

=INT((<your date> - <Start date>)/7)

[#6]

Hi@Sergei Baklan 

I've same problem as Susan mentioned, Let's take July month and the Employee started working on Jul1 (monday) and his ending date is 6(saturday) i would get 1 as output. If start date is Jul1 (monday) and end date is July 10 (wednesday) then i should get output as 2.

Another question: irrespective of start date(i.e,  july 1 - July 6) if end date falls before tue (i.e, july 9) i should get output as 1 and so on for the following days.

appreciate your help in finding the solution, thanks in advance.

Vaman21

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@Sergei Baklan wrote:

Hi Susan,

If you'd like to calculate number of full weeks from Start Date that could be

=INT((<your date> - <Start date>)/7)

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[#7]

@Susan Authers 

Here is a complete guide to date math (Including the Weeknumber function) + a Free quick reference card to date Math

https://www.youtube.com/watch?v=qIZxeOq-QDk

Hope that helps

Nabil Mourad