zero hour

US /ˈzɪroʊ ˈaʊər/
UK /ˈzɪroʊ ˈaʊər/
"zero hour" picture
1.

ゼロアワー, 開始時刻

the time at which a planned operation or event is scheduled to begin

:
The troops were ready for zero hour, awaiting the command to advance.
部隊はゼロアワーに備え、前進命令を待っていた。
The launch countdown began, signaling that zero hour was approaching.
打ち上げカウントダウンが始まり、ゼロアワーが近づいていることを知らせた。