We will consider the FAQ 1 example itself to apply the Conditional Formatting for the WEEKNUM formula’s result as follows: First, choose cell C2, i.e., the result cell à select the “Format” tab à click the “Conditional formatting” option as shown below. The “Conditional format rules” window appears on the right side of the window. Here, click the “Add another rule” option. 1. The “Apply to range” field is already filled with the result cell address, C2. 2. Now, select “Is not empty” from the “Format cells if…” drop-down under the “Format rules” field. 3. Next, select yellow color in the “Fill color” from the “Formatting style” options under the “Format rules” field. 4. Finally, click “Done” to close the “Conditional format rules” window. We will get the final output as shown below.