\newcommand for stating middle or end of the month based on compile date

Question

I am new to \LaTeX but am very excited to use it. At work I have a use for it for which it is perfect. Essentially we create the same report twice a month, which up til now has been done manually in Word. I would like to present this solution, which will offer huge time savings. Only problem is if there is any editing of code needed my boss will be hesitant. If I can present it in such a way that it just works he will not worry about other/future staff not understanding.

The rest of the document is working great, in the sense that all the moving parts change each runtime. But am stuck on going about making a command which would make the date stamp of the document either say middle or end of the current month? I think this should be possible.

Would trying to change something like \datetime be better than a new command? How would I go about doing either?

It will be going in the header as below.

\pagestyle{fancy}
\fancyhf{}

\chead{Mid-August}

Answer 1

TeX provides the \year, \month and \day count registers, having the relevant date of compilation time (unless explicitly manipulated)

Querying with \ifnum\day < 15 it's possible to ask whether it is the 'middle' of the month or rather towards the end. (Well, the precise definition is to specified ;-)

datetime is the predecessor of datetime2, but easier to use (in my opinion), \monthname[\the\month] prints the name of the month.

I explicitly used the optional argument to show the manipulated values of \month and \day, omitting the optional argument forces \monthname to use the current value of the \month count register, which is in principle correct too since the current month shall be used anyway for the heading.

\documentclass{article}

\usepackage{fancyhdr}
\usepackage[english]{babel}
\usepackage{datetime}
\usepackage{blindtext}

\pagestyle{fancy}
\fancyhf{}

\chead{\ifnum\day < 15
  Mid-%
  \else
  End-%
  \fi%
  \monthname[\the\month]%
}


\begin{document}
\blindtext[5]
\clearpage
\day=10
\month=5
\blindtext[5]


\end{document}