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

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

📎 This article includes 1 downloadable practice file ↓

⏱ 2 min readUpdated 28 September 2026

DateLevel: ExpertAvailable in: Excel 2007+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. DAYS360 in practice
  5. Where you will use it
  6. Worked example
  7. Mistakes people make
  8. Related functions
  9. Continue learning

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

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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.

DAYS360 in practice

Where you will use it

  • Interest on a 30/360 basis
  • Accounting systems with 360-day years
  • Bond calculations

Worked example

StartEndFormulaResult
31-Jan-202601-Mar-2026=DAYS360(A2,B2)31
01-Apr-202631-Mar-2027=DAYS360(A3,B3)360
28-Feb-202631-Mar-2026=DAYS360(A4,B4)30

Results calculated in Excel.

Mistakes people make

MistakeWhat to do instead
Actual days neededUse DAYS or B-A
US vs European methodThird argument TRUE uses the European method

DAYS · YEARFRAC

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All Date & Time guides →
TIMEVALUE Function in Excel: Text Time to Real TimeDateLevel: IntermediateAvailable in: Excel 2007+TIMEVALUE turns text like "2:45 PM" into a real time…DATEVALUE Function in Excel: Convert Text Dates Into Real DatesDATEVALUE turns a date written as text into a real date number. It follows…MINUTE Function in Excel: Minute From a TimeDateLevel: BeginnerAvailable in: Excel 2007+MINUTE returns 0–59 from a time.Syntax=MINUTE(serial_number)ArgumentWhat it.SECOND Function in Excel: Second From a TimeDateLevel: BeginnerAvailable in: Excel 2007+SECOND returns 0–59. Mostly used to strip seconds from machine.

📎 Practice files for this article

  • 📗
    Practice workbook: Dates & times22 tasks on realistic sales data — type your formula, the Check column turns green when it is right. Answers sheet included.
    ⬇ XLSX · 34 KB

Free to use for learning. Files with macros (.bas) are plain text — import them with Alt+F11 → File → Import File, and always test on a copy.

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