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zero hour

noun
1.
the time set for the beginning of a military attack or operation.
2.
the time set for the beginning of any event or action.
3.
a decisive or critical time.
Origin
1915-1920
1915-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for zero-hour

zero hour

noun
1.
(military) the time set for the start of an attack or the initial stage of an operation
2.
(informal) a critical time, esp at the commencement of an action
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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