It happens on Ubuntu 14.04 too.
# date Sun Oct 18 02:08:18 BRST 2015
# date --date=2015-10-18 date: invalid date ‘2015-10-18’
# date --date=2015-10-19 Mon Oct 19 00:00:00 BRST 2015
# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty
It happens on Ubuntu 14.04 too.
# date
Sun Oct 18 02:08:18 BRST 2015
# date --date=2015-10-18
date: invalid date ‘2015-10-18’
# date --date=2015-10-19
Mon Oct 19 00:00:00 BRST 2015
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty