Have anyone heard about 'G hour' or 'hour G'?

[Nessie]

Hi,
Have any of you heard about 'G hour' or 'hour G'? In my language it is very commonly used to mean 'the time when it is necessary for something to be done'. For example, Vietnam has now joined the WTO, and foreign retail chains have now been allowed to enter the country, so it's time (in Vietnamese people say 'G hour') for domestic retail chains to improve their services in order to compete with foreign ones. I just wonder whether people can understand me if I use 'G hour' in this case.
By the way, can I use 'prime time' here? I'm afraid not because in most dictionaries it just has the meaning of 'the time when the largest number of people are watching or listening in TV and radio broadcasting'.

Thank you very much,
Nessie.
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[Alan]

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Hi Nessie,

Nice to see you back again. No, I don't know about 'G hour'. All I can offer is 'the moment of truth'. I don't whether that fits the bill?

Alan
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English as a Second Language
You can read my ESL story A Rhapsody of Words

[Nessie]

Hi Alan,
It's so nice to see you again, too These days I'm rather busy with my schooling and other stuff, so I was not online here for a while I think 'the moment of truth' is not very suitable in this case. Please have a look at this (it is my translation, and as I don't know the world yet, I use 'G hour' instead):

[Nessie]

Hi Alan,
I've just found out I could use 'zero hour' to express that idea But now comes another question - do people often say 'zero hour' or 'the zero hour'?

Many thanks,
Nessie
_________________
... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...