Syntax

YEARFRAC(start_date, end_date, [day_count_convention])

Arguments

The printed syntax lists 3 argument(s), in order:

  • start_date
  • end_date
  • ay_count_conventio optional

“optional” marks an argument Google prints in square brackets; “repeatable” marks one Google prints with “…”.

Description from Google Docs Editors Help

“Returns the number of years, including fractional years, between two dates using a specified day count convention.”

Google’s help article for YEARFRAC →

Source: Google Docs Editors Help, “Google Sheets function list” (support.google.com/docs/table/25273), record record 26 of 516, data fetched 28 September 2026. Data month: September 2026.