yogi_Conditionally Format Range S3:DY7 For Production Days For Each Install

Google Spreadsheet   Post  #2240

Yogi Anand, D.Eng, P.E.      ANAND Enterprises LLC -- Rochester Hills MI     Sep-17-2017
(Comment by Jeremy Knightly )to original question by: ThomFlash 

How to automate Gantt Chart creation using logical expressions to change cell colors...

Objective: I am building project management spreadsheet like MS Project for tiny house projects, and wish to use changes in date fields to alter colors in a Gantt chart view to indicate task priority and date handling.

Status: Currently, a few columns on the left include tasks and staff assignments, as well as start and end dates. We use the right side of the sheet for a Gantt chart display, with a column for each date in the project life cycle. Conditional formatting changes the cell color for each date in which a "t" is included as a task date. This changes the cell color from the default (white) to a color indicating a date range for task handling (the character "t" and background are changed to same light red). This creates the Gantt chart view.

Sample: Below is a sample of the existing spreadsheet:

(open full-size image)

Process: To simplify management, I'd like for values in Start Date and End Date to automatically change corresponding cell colors in the Gantt chart. In Excel, I've accomplished this using a logical test in each Gantt chart cell to:

1. Get it's date from the timeline at the top of the chart, then
2. Check for "true" to test that the cell's date is "greater than or equal to" the Start Date field, and
3. Check that the cell's date is also "less than or equal to" the End Date field. 

If the above test is true (maybe AND formula?), I figure I can post a character ("t" for general tasks, though others are used to indicate task priority) in the cell which enacts automatic Conditional Formatting to create a colored cell. 

Any help with a simple and scalable solution is greatly appreciated. Thanks!

Thom Stanton

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