DAYS360 — Combined With Other Functions

What Is the DAYS360 Function in Excel?

The DAYS360 function is part of Excel's Date & Time function category. It is one of the most widely used functions for data analysis and manipulation in Microsoft Excel.

Syntax

=DAYS360(argument1, argument2, ...)

Each argument serves a specific purpose. Below we break down every parameter with examples.

How to Use DAYS360 — Step by Step

Step 1: Set Up Your Data

Ensure your data is organized in a clean table format. Use Excel Tables (Ctrl+T) for structured references that automatically expand.

Step 2: Enter the Formula

Type =DAYS360( in your target cell and select the appropriate arguments. Press Enter to calculate.

Step 3: Verify the Result

Cross-check the result with a manual calculation on a few data points. Use the Evaluate Formula tool for complex formulas.

Practical Examples

Example 1 — Basic Usage:

=DAYS360(A2:A100)

This applies DAYS360 to the range A2 through A100.

Example 2 — With Criteria:

=DAYS360(A2:A100, B2:B100, "criteria")

Common Errors & Fixes

• #VALUE! error: Usually caused by passing text where a number is expected. Check your data types.
• #REF! error: A referenced cell has been deleted. Update your formula references.
• #N/A error: The lookup value wasn't found. Check for leading/trailing spaces with TRIM().

💡 Pro Tip: Combine DAYS360 with other functions for more powerful results. Nested formulas can solve complex business problems in a single cell.

Best Practices

Always use absolute references ($A$1) when you need a fixed reference point. Use named ranges for readability. Document complex formulas with cell comments.