Developer credits
Git commits in Moodle 3.1.0 by Grigory Baleevskiy
commit 53754839d267ce11897891ee837c672ed2412e65 Author: Grigory Baleevskiy <grigory@catalyst-au.net> Date: Sun, 31 Jan 2016 09:14:48 +0800 Tag: v3.1.0-beta MDL-52978 core_lib: fixed wrong days showing for dates in datepicker