Latex sorting bibliography - conditional-statements

Question

I have a piece of code that sort my bibliography by date and type from a .bib file. It works just fine however i am asked to provide my bibliography from a starting year say 1996 i.e. skipping everything before.any help on what to amend to add this condition? thanks
for the .bib file please save in a file the following test found online, this is an example of database to be sorted:
%%%%%%%%%%% mybib.bib %%%%%%%%%%%%%%%%%%%
#BOOK{HK,
AUTHOR={H. Kopka and P. W. Daly},
TITLE={A Guide to LaTeX},
PUBLISHER={Addison-Wesley},
ADDRESS={Reading, MA},
YEAR=1999.
}
#BOOK{MG,
AUTHOR={M. Goossens and F. Mittelbach and A. Samarin},
TITLE={A LaTeX Companion},
PUBLISHER={Addison-Wesley},
ADDRESS={Reading, MA},
YEAR=1994.
}
#ARTICLE{Pan,
AUTHOR={D. Pan},
TITLE={A Tutorial on MPEG/Audio Compression},
JOURNAL={IEEE Multimedia},
YEAR={1995},
VOLUME= {2} ,
PAGES={60-74},
MONTH={Summer}.
}
#INPROCEEDINGS{Boney96,
AUTHOR={L. Boney and A. H. Tewfik and K. N. Hamdy},
TITLE={Digital Watermarks for Audio Signals},
booktitle={Proceedings of the Third IEEE International Conference on
Multimedia},
PAGES={473-480},
MONTH={June},
YEAR={1996}.
}
%%%%%%%%%%%%% end %%%%%%%%%%%%%%%%%%%%%
\documentclass[12pt]{article}
\usepackage[english]{babel}
\usepackage[backend=biber,sorting=ddatent,style=phys, defernumbers=true, natbib=true, isbn=true]{biblatex}
%sorting by date
\DeclareSortingScheme{ddatent}{
\sort{
\field{presort}
}
\sort[final]{
\field{sortkey}
}
\sort[direction=descending]{
\field[strside=left,strwidth=4]{sortyear}
\field[strside=left,strwidth=4]{year}
\literal{9999}
}
\sort[direction=descending]{
\field[padside=left,padwidth=2,padchar=0]{month}
\literal{00}
}
\sort[direction=descending]{
\field[padside=left,padwidth=2,padchar=0]{day}
\literal{00}
}
\sort[direction=descending]{
\field[padside=left,padwidth=4,padchar=0]{volume}
\literal{9999}
}
\sort{
\name{sortname}
\name{author}
\name{editor}
\name{translator}
\field{sorttitle}
\field{title}
}
\sort{
\field{sorttitle}
\field{title}
}
}
\addbibresource{mybib.bib}
\begin{document}
\printbibliography[heading=none,type=book]
\printbibliography[heading=none,type=article]
\end{document} `

Answer 1

You mustn't use . at the end of your bib entries.
Back to your actual question: you can define bibcheck:
\documentclass[12pt]{article}
\usepackage[english]{babel}
\usepackage[backend=biber,sorting=ddatent,style=phys, defernumbers=true, natbib=true, isbn=true]{biblatex}
%sorting by date
\DeclareSortingScheme{ddatent}{
\sort{
\field{presort}
}
\sort[final]{
\field{sortkey}
}
\sort[direction=descending]{
\field[strside=left,strwidth=4]{sortyear}
\field[strside=left,strwidth=4]{year}
\literal{9999}
}
\sort[direction=descending]{
\field[padside=left,padwidth=2,padchar=0]{month}
\literal{00}
}
\sort[direction=descending]{
\field[padside=left,padwidth=2,padchar=0]{day}
\literal{00}
}
\sort[direction=descending]{
\field[padside=left,padwidth=4,padchar=0]{volume}
\literal{9999}
}
\sort{
\name{sortname}
\name{author}
\name{editor}
\name{translator}
\field{sorttitle}
\field{title}
}
\sort{
\field{sorttitle}
\field{title}
}
}
\begin{filecontents*}[overwrite]{\jobname.bib}
%%%%%%%%%%% mybib.bib %%%%%%%%%%%%%%%%%%%
#BOOK{HK,
AUTHOR={H. Kopka and P. W. Daly},
TITLE={A Guide to LaTeX},
PUBLISHER={Addison-Wesley},
ADDRESS={Reading, MA},
YEAR=1999,
}
#BOOK{MG,
AUTHOR={M. Goossens and F. Mittelbach and A. Samarin},
TITLE={A LaTeX Companion},
PUBLISHER={Addison-Wesley},
ADDRESS={Reading, MA},
YEAR=1994,
}
#ARTICLE{Pan,
AUTHOR={D. Pan},
TITLE={A Tutorial on MPEG/Audio Compression},
JOURNAL={IEEE Multimedia},
YEAR={1995},
VOLUME= {2} ,
PAGES={60-74},
MONTH={Summer},
}
#INPROCEEDINGS{Boney96,
AUTHOR={L. Boney and A. H. Tewfik and K. N. Hamdy},
TITLE={Digital Watermarks for Audio Signals},
booktitle={Proceedings of the Third IEEE International Conference on
Multimedia},
PAGES={473-480},
MONTH={June},
YEAR={1996},
}
%%%%%%%%%%%%% end %%%%%%%%%%%%%%%%%%%%%
\end{filecontents*}
\addbibresource{\jobname.bib}
\defbibcheck{recent}{%
\iffieldint{year}
{\ifnumless{\thefield{year}}{1996}
{\skipentry}
{}}
{\skipentry}}
\begin{document}
\nocite{*}
\printbibliography[heading=none,type=book,check=recent]
\printbibliography[heading=none,type=article,check=recent]
\end{document} `