appointed hour, target day, H-hour, D-day, the time*, countdown*, jump-off*; see also attack 1, crisis.
"zero hour." YourDictionary, n.d. Web. 22 March 2019. <https://thesaurus.yourdictionary.com/zero-hour>.
zero hour. (n.d.). Retrieved March 22nd, 2019, from https://thesaurus.yourdictionary.com/zero-hour
A decisive point:
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