datetime2: future dates in a specific (ad hoc) format

Question

I've seen these posts ...

• Changing date format in datetime2
• latex date calculations with datetime2 and ddmm format

... and in theory I ought to be knowing what to do, yet... I am not. Instead... I'm lost!

I don't want to change the general Format of the way the date is beeing displayed (that for the 1st example), but I do want to get a Future date (in 5 days), but not in the Format I get from the 2nd example.

So if today is June 29th of 2020 (ISO 2020-06-29) and I want the date 5 days in the future I should get july 4th (I see I can do this with datetime2), but be able to format the ouput ad hoc and not change it for the whole document.

Now I would like to be able to have (in abstract) something like this:

\offsetdate{opffset}{dateformat}{seperator}

... respectivly to do like this:

\offsetdate{5}{ddmmyyyy}{.}

to get 05.07.2020

\offsetdate{5}{dmyyyy}{.}

to get 5.7.2020

\offsetdate{5}{yyyymmdd}{}

to plainly get 20200704

Any hints will be greatly appreciated!

Answer 1

from --

http://ctan.mirror.garr.it/mirrors/CTAN/macros/generic/texdate/texdate.pdf

and --

Date format: YYYY-MM-DD

\documentclass{article}
\usepackage{texdate}
\begin{document}
%\initcurrdate
%\printfdate{ISOext}
\initdate{2019}{6}{24}
\printfdate{ISO}
\printfdate{ISOext}\par
\advancebydays{8}
8 days later: \printfdate{ISO}\par
\end{document}

Addendum -- with reference to the OP example requirement of 29 Jun 2020

\documentclass{article}
\usepackage{texdate}
\begin{document}
\initdate{2020}{6}{29}
\advancebydays{5}
5 days later:
|ISO date|:\printfdate{ISO}\par
\def\setdateformat{d\ B\ Y}
|d\ B\ Y|: \printdate\par
\def\setdateformat{d.m.Y}
|d.m.Y|: \printdate\par
\def\setdateformat{a,\ d\ b\ Y}
|a,\ d\ b\ Y|: \printdate\par
\printfdate{ISOext}\par
\end{document}