How to to add “th” or “rd” to the date

Question

Hi this is the preamble I have used

\documentclass[prd,aps,superscriptaddress,twocolumn,10pt]{revtex4-1}
\usepackage{times}                          
\usepackage[a4paper, left=1.85cm, right=1.85cm,top=1.85cm, bottom=1.85cm]{geometry}       
\usepackage[font=small,labelfont=bf]{caption}                      
\usepackage{graphics,graphicx,epsfig,ulem}  
\usepackage{amsmath}                        
\usepackage{etoolbox}                       

\makeatletter
\patchcmd{\frontmatter@RRAP@format}{(}{}{}{}
\patchcmd{\frontmatter@RRAP@format}{)}{}{}{}
\renewcommand\Dated@name{}
\makeatother

\usepackage{fancyhdr}
\pagestyle{fancy} 
\date{Submitted: \today{}, Date of Experiment: \nth{11} December 2018}       

It's the end part I need help with

\date{Submitted: \today{}, Date of Experiment: \nth{11} December 2018}

As you can see I have done \nth{11} December 2018 which works fine I was just wondering if there is a way to add that to the \today{} because I can't seem to do it :( Please help I'm new to Latex

Answer 1

The datetime2 along with the fmtcount package allows you to easily create new date formats, and it has an ordinal date command. It also allows you to create named dates for display. I've done this for the experiment date.

\documentclass{revtex4-1}
\usepackage{fmtcount}% required in addition to datetime2
\usepackage[calc]{datetime2}
\DTMnewdatestyle{usvardate}{%
\renewcommand{\DTMdisplaydate}[4]{%
  \DTMmonthname{##2} \protect\ordinalnum{##3}, \number##1 }%
 \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
}
\DTMsetdatestyle{usvardate}
\DTMsavedate{expdate}{2018-12-11}

\date{\today{}. Date of experiment: \DTMusedate{expdate}}
\usepackage{etoolbox}                       

\makeatletter
\patchcmd{\frontmatter@RRAP@format}{(}{}{}{}
\patchcmd{\frontmatter@RRAP@format}{)}{}{}{}
\renewcommand\Dated@name{}
\makeatother

\begin{document}
\maketitle
\end{document}