Functions fn:seconds-from-dateTime and fn:seconds-from-time should return a xs:decimal but they are only returning whole numbers. xs:dateTime and xs:time show the fractional seconds so the data is parsed correctly, but then the functions cut off the decimal.

See tests:
test_xfromtime_02
test_secondsfromdatetime_03

In files:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_functions/Functions.tdml
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/TestDFDLExpressionsDebug.scala