Redmine

This patch replaces all occurrences of Date.today with User.current.today.

Date.today always returns the date according to the server's local time zone, leading to all sorts of edge cases that occur more or less often depending on how large the offset between a user's timezone and the server timezone is. A test case illustrating the problem using Issue#overdue? as an example is included.

The patch was extracted from Planio and also includes the changes proposed earlier by Holger Just in #20473, with the addition of two test cases to cover the date manipulation changes in Query#date_clause.