In military slang, "Zero Dark Thirty" refers to an unspecified time in the early morning hours, typically between midnight and dawn.
The title of the 2012 film serves as both a literal reference to a specific military time and a metaphor for the secrecy surrounding the hunt for Osama bin Laden. Military Definition and Origins subtitle Zero Dark Thirty
: Military operations often begin during this window to utilize the cover of darkness and the element of surprise. Significance to the Film In military slang, "Zero Dark Thirty" refers to