DAYS360 Function in Excel: Days on a 360-Day Year

⏱ 1 min readUpdated 28 September 2026

DateLevel: ExpertAvailable in: Excel 2007+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. Related functions

DAYS360 counts days as if every month had 30 — the convention some interest and bond calculations use.

Syntax

=DAYS360(start_date, end_date, [method])
Argument What it means
method FALSE = US (NASD), TRUE = European.

Examples

Example 1

=DAYS360(A2, B2)

Interest days for a 30/360 loan.

DAYS · YEARFRAC

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