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Are you referring to the exact time of the New Moon, which we can't observe?
The same principle will apply for the exact time of the Full Moon. The Moon will appear full for about a day before and after the exact time of the Full Moon. As the light across the Moon is continually expanding (waxing) then contracting (waning), there will be a single instance when the Moon is exactly full. The "exact" time to the nearest hour and minute of a day is given as GMT or UTC time. To get the exact time for your locality you have to allow for your time zone and daylight saving if applicable.
Regards, Rob
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