Source: <a href='https://github.com/imanuelcostigan/fmdates/blob/master/R/date-counters.R'><code>R/date-counters.R</code></a></small>
    <div class="hidden name"><code>actual_actual_isda.Rd</code></div>
    </div>

    <div class="ref-description">
    <p>This calculates the years between two dates using the Actual/Actual ISDA
day basis convention. This convention counts the number of calendars
between the start and end dates. The definition of a year is contingent on
whether the year is a leap year or not