\documentclass[]{article}\usepackage{html}\usepackage[T1]{fontenc}\begin{document}\bodytext{BGCOLOR=white LINK=#083194 VLINK=#21004A}\begin{titlepage}\begin{latexonly}\noindent {\bf Community Climate System Model} \\\noindent National Center for Atmospheric Research, Boulder, CO \\\vspace{2in}\end{latexonly}\begin{center}{\Large\bf Time and Date Utility Library Design} \\\medskip{Brian Eaton, NCAR/CGD}\end{center}\end{titlepage}\tableofcontents\newpage%\section{Synopsis}\input{timelib_syn}%\section{Algorithmic Description}%\input{comp_alg}%\section{Requirements}\input{timelib_req}%\section{Architecture}%\input{comp_arch}\section{Time Class}%\subsection{Description}\input{time_desc}\subsection{Design}\subsubsection{Class Definition}The attributes of the time class expressed as a Fortran 90 derived type are:\noindent type time\_t \\\indent private \\\indent integer :: days \\\indent integer :: seconds \\\noindent end type time\_t\subsubsection{Design Strategy}The precision and range requirements of time intervals and dates determine their representation in terms of native machine types (i.e, floating point numbers and integers). The time and date classesare defined to represent time intervals and dates, respectively, in order to insulate the user interface from the underlying representation.  This not only makes it easier to pass arguments (e.g., passing adate argument versus passing all the integers that represent the components of a date), it also means that the interface doesn't have to change if the underlying representation were changed to support new precision or range requirements.When an error is encountered the functions in this library will call a private error handling routine which issues a message explaining the error and then calls exit. The user may be able to customize theerror handling.\section{Date Class}%\subsection{Description}\input{date_desc}\subsection{Design}\subsubsection{Class Definition}The attributes of the date class expressed as a Fortran 90 derived type are:\noindent type date\_t \\\indent private \\\indent integer :: year \\\indent integer :: month \\\indent integer :: day \\\indent integer :: sec \\\noindent end type date\_t\subsubsection{Design Strategy}As with the time class, the date class hides the representation of its internal attributes from the user, thereby increasing the class's extensibility and portability.\section{Review Status}\noindent{\bf Requirements and Design Review} \\\begin{tabular}{r p{1.3in} p{2in}}{\bf Review Date:} & March 1, 2001 \\ \\{\bf Reviewers:}   & Byron Boville        & NCAR/CGD \\                   & Dave Williamson      & NCAR/CGD \\                   & Phil Rasch           & NCAR/CGD \\                   & Cecelia DeLuca       & NCAR/SCD \\                   & Jim Rosinski         & NCAR/CGD\end{tabular}%\section{Glossary}\input{timelib_glos}%\section{Bibliography}%\bibliography{comp} %\bibliographystyle{plain}%\addcontentsline{toc}{section}{Bibliography}\section*{Appendix:  Fortran Interface}\addcontentsline{toc}{section}{Appendix:  Fortran Interface}%\section{MFM_Time Interface}\input{MFM_Time}%\section{MFM_Date Interface}%\input{MFM_Date}%\section{MFM_TimeMgr Interface}%\input{MFM_TimeMgr}%\section{MFM_Alarm Interface}%\input{MFM_Alarm}%\section*{Appendix:  C Interface}%\addcontentsline{toc}{section}{Appendix:  C Interface}%\section{MF_Time Interface}%\input{MF_Time}%\section{MF_Date Interface}%\input{MF_Date}%\section{MF_TimeMgr Interface}%\input{MF_TimeMgr}%\section{MF_Alarm Interface}%\input{MF_Alarm}\end{document}