I'm able to change today's date to different format: month YEAR, normal and digits. Now I also need to add a future date: 28 days from today. How can I do that?
\documentclass[a4paper,12p]{article}
\usepackage{datetime}
\newdateformat{monthyeardate}{%
\monthname[\THEMONTH] \THEYEAR}
\newdateformat{normal}{%
\longdate \ordinaldate{\THEDAY} \monthname[\THEMONTH] \THEYEAR}
\newcommand\twodigits[1] {\ifnum#1<10 0#1\else #1\fi}
\newdateformat{quoteNo}{%
\THEYEAR--\twodigits{\THEMONTH}--\THEDAY }
\begin{document}
\normal \today \\
Quote No: \quoteNo \today --1 \\
Expiry: %28 days from now
\end{document}
