This calculates the years between two dates using the actual/360 day basis convention. This convention counts the number of calendars between the start and end dates and assumes a year consists of 360 days. This is also known as the A/360, Act/360 or French day basis convention.
actual_360(date1, date2)A date-time object
A date-time object
a numeric value representing the number of years between
date1 and date2.
The year fraction is calculated as: $$\frac{Number of calendar days}{360}$$
The order of date1 and date2 is not important. If date1
is less than date2 then the result will be non-negative. Otherwise,
the result will be negative.
Other counter methods: actual_365,
actual_actual_isda,
is_valid_day_basis,
thirty_360_eu_isda,
thirty_360_eu_plus,
thirty_360_eu, thirty_360_us,
thirty_360, year_frac