Nobody knowing the DAY nor HOUR is a play on words and concepts like "every eye would see him of the TRIBES OF THE EARTH" suggests everyone on the earth would see Jesus or the "sign" but in fact it is limited. Even the WTS recognizes that the "every eye" would refer to only those who would be his followers, those who would mourn him.
Likewise, the DAY nor HOUR is also a play on words since several Bible chronologies are provided to establish the specific YEAR of both the first and second coming as follows:
1) 1335 days prophecy, 45 years after the "end of the gentile times" which ends 1290 days (Daniel 12) would determine when the Messiah would arrive. "Happy is the one who KEEPS IN EXPECTATION OF THE 1335 DAYS". If we were not supposed to be counting days and "nobody knows the DAY.." then why was this 1335 days given? The "end of the gentile times" or the "appointed times of the nations ended when the nations stopped ruling over Palestine and returned it to the Jews. That was 1947; that ended 1290 days. Add 45 "days"/years to that to get the year of the second coming-1992.
This is cross-matched with two other year-specific prophecies.
2) The "7 times" prpohecy, of course, well-known to Jehovah's witnesses established 2520 years from the fall of Jerusalem until the second coming. The fall of Jerusalem dated either in 607BCE, 587BCE or 529BCE gives you your pick: 1914, 1934 or 1992, respectively.
3) Finally, the Messiah arrifes twice during the 70th week. The first 70th week is was from 29-36CE. Each 70th week a form of ending "gift and sacrifice" takes place at mid-week. For the first coming Christ leaves at mid-week, his death ending the symbolic animal sacrifices. The second 70th week he arrives to end the annual Lord's supper which is the new form of "gift and sacrifice" being celebrated, to be kept by his followers until he arrives when he eats with them one last time upon his arrival. This allows us to date the second coming during the year of the mif-week passover of the 70th week occurring, obviously, during the "last days". You can't miss this since it only occurs every 490 years. But very simple to calculate. Simply count 490-year periods from 36CE down to our day, which is 1960 years. 1960 plus 36 is 1996 and thus the last days 70th week is from 1989 to 1996 with mid-week passover occurring April 6, 1993. Thus Christ must arrive no earlier than Passover 1992 but no later than Passover 1993 to eat the final "Lord's supper".
Taking into consideration the above, therefore, while "nobody knows the DAY nor HOUR", we can determine the MONTH and YEAR. That is, a 4-month period from November 30, 1992 to April 6, 1993 is when the Messiah would appear per fulfilled Bible prophecy (Nov. 30, 1947 is when the gentile times officially ended with the Partition Agreement assigning Palestine back to the Jews so that they had a country again).
As noted above, this does not violate the specific word of scripture that nobody knows the day nor hour. To further this reference, though, in actually, since the Messiah's return would occur over a 3-day period, again, nobody would know the day nor hour, but it was sometime between December 24-26, 1992.
JC