How Close? Erev Shabbos, After Shkia...

"...these days of bein hashmashos of the 6th and 7th millenium, the 6th and 7th of the days of Creation, that it is bein hashmashos is on everyone's lips, and all are trembling towards it to finish their melacha before it gets dark (Rashi, Ksuvos 103a)..."

Letter of the Lubavitcher Rebbe, 23 Kislev 5716 (1955)