Here is the calendar page for any clipped month of 27 sols. There is no Jovisol at the end of a clipped month, so Mercusol can be a holisol instead:
Written date format
The format for Martian dates is very important, because there exists the possibility of confusion. Fortunately, an international standard has already been established for the format of Earth dates, namely the ISO-8601 date format, that can easily be adopted for Martian dates. The format specifies year first, followed by month, followed by day, seperated by hyphens, for example: 2000-06-18. The year should never be abbreviated to two digits. If a month or day number is less than 10, then a leading zero is added to make 2 digits.
There are several important advantages of the ISO standard. Firstly, it favours neither the European convention of day-month-year, nor the American convention of month-day-year, thus it is a diplomatic choice. Perhaps more importantly, the most significant number (the year) is on the left and the least significant (the day) is on the right, in harmony with the rest of our numerical system.
Thus, it makes sense for Martian dates to be written mir-month-sol. Having a standard date format is even more important in relation to the Martian calendar, because the year is currently a low two-digit number and can easily be confused with the month or sol number. Because of this, I have prepended the mir with the capital letter 'M'. This both identifies which part of the date field is the mir, and also distinguishes Martian dates from Gregorian.
Although this is not specified in the ISO standard, I often spell out the month in letters, either fully or as an abbreviation, to further minimize any possibility of confusion. Because all months in the Areosynchronous Calendar begin with a different letter, we can conveniently abbreviate them to a single character when writing dates, for example: M13-A-18.