It is a great scripture to be examining biometrics.
I've done a little bit of research on the WTBTS literature and it many cases they cite it in reference to the time when the holy spirit was poured out at Penticost 33CE and they were the last days to 70CE.
One of the references in which they relate it to these days, in which they believe they are in the last days is in "Jehovah's Day (jd) Chapter 13 para 4
'Now consider our time, Joel's prophecy has been undergoing its major fulfillment since early in the 20th centruy. Spirit-anointed Christians - male and femal, old and your-began to "prophecy," that is, to declare "the magnificent things of God." including the good news of the Kingdom, now established in the heavens.
Another quote from 'Kingdom Come[' Chapter 15 para 14
'Just as Joel's prophecy had been fulfilled at Pentecost 33CE during the 'last days' of the Jewish system of things, now that prophecy began to have a major fulfillment during the 'last days of Stan's world system. Enlightened and motivated by God's spirit, modern-day anointed 'sons and daughters' of Jehovah did "certainly prophesy," as they got busy in warning the world of mankind of the approach of "the great and illustrious day of Jehovah," and of the urgent need to 'call on the name of Jehovah' in order to be saved - Acts 2:16-21'
Interesting how they have changed the meaning of prophecy and that only the anointed are doing this (the other sheep are just helping or have declared that 'We will go with you people, for we have heard that God is with you people' - from the Jehovah's Day book), so it seems that they do not 'prophecy.'