The YearFraction command returns the period between fromdate and todate as a fraction of the year calculated according to the day counting convention specified by daycounter. If no day counter is specified, the default one will be used.

See DayCounter or CalendarsAndDayCounters for a detailed description of the supported day count conventions and additional examples.

$\mathrm{with}\left(\mathrm{Finance}\right)\:$

$\mathrm{YearFraction}\left(''Dec-20-2005''\,''Nov-05-2006''\right)$

$0.8767123288$

$\mathrm{YearFraction}\left(''Dec-20-2005''\,''Nov-05-2006''\,\mathrm{ISMA}\right)$

$0.9166666667$

$\mathrm{YearFraction}\left(''Dec-20-2005''\,''Nov-05-2006''\,\mathrm{Simple}\right)$

$0.8750000000$

$\mathrm{YearFraction}\left(''Dec-20-2005''\,''Nov-05-2006''\,\mathrm{OneDay}\right)$

$1.$

$\mathrm{DC}≔\mathrm{Finance}:-\mathrm{DayCounter}\left(\mathrm{OneDay}\right)\:$

$\mathrm{YearFraction}\left(''Dec-20-2005''\,''Nov-05-2006''\,\mathrm{DC}\right)$

$1.$

$\mathrm{SetEvaluationDate}\left(''November\; 17,\; 2006''\right)\:$

$\mathrm{EvaluationDate}\left(\right)$

$''November\; 17,\; 2006''$

$\mathrm{YearFraction}\left(''December\; 01,\; 2007''\,''December\; 01,\; 2008''\right)$

$1.000232053$

$\mathrm{YearFraction}\left(''December\; 01,\; 2007''\,''December\; 01,\; 2008''\,\mathrm{Thirty360European}\right)$

$1.$

$\mathrm{YearFraction}\left(''December\; 01,\; 2008''\right)$

$2.038588218$

$\mathrm{YearFraction}\left(''December\; 01,\; 2008''\,\mathrm{Thirty360European}\right)$

$2.038888889$

The Finance[YearFraction] command was introduced in Maple 15.

For more information on Maple 15 changes, see Updates in Maple 15.