* YEARFRAC
*
* Calculates the fraction of the year represented by the number of whole days between two dates
* (the start_date and the end_date).
* Use the YEARFRAC worksheet function to identify the proportion of a whole year's benefits…
* AMORLINC
*
* Returns the depreciation for each accounting period.
* This function is provided for the French accounting system. If an asset is purchased in
* the middle of the accounting period, the prorated depreciation is taken into…
* COUPDAYBS
*
* Returns the number of days from the beginning of the coupon period to the settlement date.
*
* Excel Function:
* COUPDAYBS(settlement,maturity,frequency[,basis])
*
* @access public
* @category Financial Functions
*
* COUPDAYS
*
* Returns the number of days in the coupon period that contains the settlement date.
*
* Excel Function:
* COUPDAYS(settlement,maturity,frequency[,basis])
*
* @access public
* @category Financial Functions
*
* COUPDAYSNC
*
* Returns the number of days from the settlement date to the next coupon date.
*
* Excel Function:
* COUPDAYSNC(settlement,maturity,frequency[,basis])
*
* @access public
* @category Financial Functions
*
