How long exactly is a 1 month pass valid?
A Global Pass - 1 month continuous is valid for train travel on each day during 1 month. The number of travel days you have, depends on the length of the month in which you start using your pass.
July has 31 days, so the pass is also valid for 31 days. February has 28 days and a pass is therefore valid for 28 days.
Here are some examples:
First travel day July 1: pass is valid from July 1 up to and including July 31.
First travel day July 12: pass is valid from July 12 up to and including August 11.
First travel day February 1: pass is valid from February 1 up to and including February 28 (or February 29 in a leap year).
First travel day is February 15: pass is valid from February 15, up to and including March 14.