age 6-40 means that 17:00 CRC/MEX (pacific) or 5 am EDT (why the USA still uses am/pm?) or 13:00 GBR might be easy to understand for some, but not all of the clan members. I even have to explain the difference from EST to EDT to some PhD's living on the east coast, I don't want to explain how to do the math to every new 13-year old from anywheretown... Or even request that from an average 8-year old kid.