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Thank you very much for the tip. It works. I am able to store the data. In fact the reason of my question is a task I have. I need to check if the changed date and current date are in the same month.

I modified a little the code above to store only monthname and added check condition ...

Dear All,
This is my first post to this forum and first of all I would like to wish all of you a Happy New Year.

Now, I have a very basic problem i latex:

My code:

\documentclass{article}
\usepackage{datetime}
\usepackage{advdate}
\begin{document}
\newdate{my_date}{\day}{\month}{\year ...