Posted by Grant Richardson, 22nd May, 2015
For describing a point in time roughly half-way through a month, you can use, for example:
the middle of June
To me, “mid-June” sounds more business-like (clear and concise). It also sounds more like an actual point in time rather than an approximate part of a larger period. So, I would tend to use it if I wanted to sound more professional.
The following is incorrect:
mid of June