gantt chart by week conditional formatting

Will you please attach a sample Excel workbook? We are not able to work with or manipulate a picture of one and nobody wants to have to recreate your data from scratch.

1. Make sure that your sample data are REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

2. Make sure that your desired results are also shown (mock up the results manually).

3. Make sure that all confidential data is removed or replaced with dummy data first (e.g. names, addresses, E-mails, etc.).

4. Try to avoid using merged cells as they cause lots of problems.

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.

Please pay particular attention to point 2 (above): without an idea of your intended outcomes, it is often very difficult to offer appropriate advice.

Hello puropuro and Welcome to Excel Forum.
This proposed solution employs two helper columns and a helper row all of which could be moved and/or hidden for aesthetic purposes.
The Week# in column E has also been changed to display only the week# as opposed to the year and week#.
The first helper column (G) calculates the Monday of the 'Plan Start Week' using:

Formula:

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The second helper column (H) calculates the Monday of the week after the duration expires using:

Formula:

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N5:CC5 display the first Monday of each week using:

Formula:

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The formula used for conditional formatting (shown in red for demonstration purposes) is: =AND(N$5>=$G10,N$5<$H10)
Let us know if you have any questions.