I came to Berlin on December 27 and stayed until now. My 90 days are almost over but last week I went to Croatia (which is not part of Schengen) for one night and came back to Berlin. My friends have told me that once I'm out of Schengen area I can restart my 90 days again.
Can I stay in Schengen area for another 90 days after leaving it for one day or do I have to leave it for 3 months to restart the 90 days period?