yearfrac: The years between two dates for a given day basis convention In ThVWh/ralibr: Function library

Description

This calculates the years between two dates using the given day basis convention.

Usage

 `1` ```yearfrac(DateBegin, DateEnd, DayCountConv, maturity_date = NULL) ```

Arguments

 `maturity_date` a vector of dates representing the maturity date of the instrument. Only used for 30E/360 ISDA day basis. `date1` A vector of dates. This will be coerced to a `Date` class. `date2` A vector of dates. This will be coerced to a `Date` class. `day_basis` The basis on which the year fraction is calculated. See [is_valid_day_basis()]

Details

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. The parameters will be repeated with recycling such that each parameter's length is equal to maximum length of any of the parameters.

Value

a numeric vector representing the number of years between `date1` and `date2`.

References

Other counter methods: `actual_360`, `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`
 ```1 2 3 4 5``` ```require(lubridate) yearfrac(ymd("2010-03-31"), ymd("2012-03-31"), "30/360us") # 2 yearfrac(ymd("2010-02-28"), ymd("2012-03-31"), "act/360") # 2.116667 yearfrac(ymd("2010-02-28"), ymd("2012-03-31"), "act/365") # 2.087671 yearfrac(ymd("2010-02-28"), ymd("2012-03-31"), "act/actisda") # 2.086998 ```