How is the six month period calculated? The six month period is calculated from the date of first enty into the Schengen region. The date of first entry is the date on which you entered the Schengen region for the first time, and subsequently
This means that if you arrive for the first time in Denmark or another Schengen country on 1 February 2010, you can stay in the Schengen region for a period of three months (90 days) within the six-month period which ends on 31 July 2010.