The Excel YEARFRAC function returns a decimal value that represents fractional years between two dates. You can use YEARFRAC to do things like calculate age with a birthdate.
- start_date – The start date.
- end_date – The end date.
- basis – [optional] The type of day count basis to use (see below).
YEARFRAC calculates a decimal number representing the fraction of a year between two dates. Excel uses whole days between two dates to work out the fraction of a year as a decimal value.
Basis – (optional) – the type of day count basis to use:
Basis 0: 30/360 – default (US convention)
Basis 1: Actual/actual
Basis 2: Actual/360
Basis 3: Actual/365
Basis 4: 30/360 (European convention)