v7.10beta [testing] is released!

See (very sensible) comment from msatter in other thread.
http://forum.mikrotik.com/t/warning-routeros-v7-10-will-break-all-scripts-based-on-system-clock-get-date-or-other-date-s/166576/7

For backwards compatibility, best to leave the old format as it was.
Introduce new variable which can be used moving forward.
Everybody happy.