No, there isn’t a special date calculation method for non-90 day visas. Each time you cross an external border, you should get a stamp with a date on it. The day you got an entry stamp, the day you got an exit stamp and every day between them count as one day towards the limit of your visa.
The Schengen Handbook for processing of visa applications has a related example:
A third country national holding a single entry visa valid for 20 days (10.11.-30.11.2010)
and allowing for 5 days of stay enters on 10.11 in Poland, where he stays until the
15.11.2010. Subsequently, holding a single entry visa valid for 60 days (8.3.-8.5.2011)
allowing for a stay of 45 days he enters Spain on 8.3.2011 and stays until 21.4.2011.
Your options are:
Credit:stackoverflow.com‘
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