Description Usage Arguments Details Value See Also
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. The year fraction is calculated as:
\frac{d_1}{{dy}_1} + \frac{d_2}{{dy}_2} + y_2 - y_1 - 1
1 | actual_actual_isda(date1, date2)
|
date1 |
A date-time object |
date2 |
A date-time object |
where:
d_1 is the remaining days in the first date's year including both the start and end date
d_2 is the number of days to the second date from the start of that year
{dy}_1 is 366 if the first date is in a leap year. Otherwise it is 365
{dy}_2 is 366 if the second date is in a leap year. Otherwise it is 365
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.
a numeric value representing the number of years between
date1
and date2
.
Other counter methods: actual_360
,
actual_365
,
is_valid_day_basis
,
thirty_360_eu_isda
,
thirty_360_eu_plus
,
thirty_360_eu
, thirty_360_us
,
thirty_360
, year_frac
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