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:
1915–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
zero hour
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
He does all of this and then at zero hour he announces that he isn't going to do anything.
Zero hour bags were soaked in warm water and washed with the other bags in the same washing machine cycle.
These data shall include zero hour data, if generated.
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