You can conditionally format an entire row in Excel by using the built-in conditional formatting rules, or by creating a custom formula. To use the built-in rules, select the cells you want to format, then go to the Home tab and click Conditional Formatting > Highlight Cell Rules > A Date Occurring. This will open the Format Cells dialog box. Select the format you want to apply from the drop-down list, then click OK.

To create a custom formula, select the cells you want to format, then go to the Home tab and click Conditional Formatting > New Rule. This will open the New Formatting Rule dialog box. Select Use a Formula to Determine which Cells to Format from the drop-down list, then enter your formula in the Format values where this formula is true text box. For example, if you want to highlight rows where the value in column A is greater than 10, you would enter =$A1>10 in this text box. Click Format, then select the format you want to apply from the Font, Border, and Fill tabs. When you're finished, click OK.