Fraction of year between dates

- example
`YearFraction = yearfrac(StartDate,EndDate,Basis)`

returns
a fraction, in years, based on the number of days between dates `YearFraction`

= yearfrac(`StartDate`

,`EndDate`

,`Basis`

)`StartDate`

and `EndDate`

using
the given day-count `Basis`

.

The number of days in a year (365 or 366) is equal to the number
of days in the calendar year after the `StartDate`

.
If `EndDate`

is earlier than `StartDate`

, `YearFraction`

is
negative.

All specified arguments must be number of instruments (`NUMINST`

-by-`1`

)
or (`1`

-by-`NUMINST`

) conforming
vectors or scalar arguments.

`date2time`

| `datetime`

| `days360`

| `days365`

| `daysact`

| `daysdif`

| `months`

| `wrkdydif`

| `year`

| `year`

| `yeardays`

| `yearfrac `

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