term arising from the military use of a 24 hour
clock (0800 for 8 AM and 2000 for 8 PM- for those people who can't tell if its
day or night) e.g. zero three hundred is 3 AM. zero dark hundred is usually inferred to as being sometime after last call and before reville...anytime between 2 and 5 AM. In other words, Waaay to
fucking early to get up and go on watch, or on a 20 mile hike.