Date-time groups, DTGs, are a way of writing the date and time (no, really?) as well as the time zone, usually within the military. They are used in orders, logs, and in my case a multi-time-zone flight. DTGs are formatted as DDhhmmZMMMYY. For example, right now it’s 16:25 on 7 August 2014 in the UK –… Continue reading How does a date-time group work?