Introduction: An Indispensable Sefer
One of the most intriguing contemporary halachic discussions is the many and varied ramifications of the International Dateline (IDL). Many sefarim and articles have been written on this beautiful topic. Therefore, I was hardly surprised when TABC talmid Aidan Samet told me that his uncle, who serves as a rav in Yerushalayim, recently released a sefer on this topic. However, when leafing through the set that Aidan and his parents gifted me of Rav Mordechai Kuber’s three-volume collection titled “Crossing the Dateline,” I very quickly realized that this is not just a sefer on the IDL. It is the Sefer on the IDL. Moreover, the author is not merely a rav in Yerushalayim but is an exceedingly talented posek whose word carries considerable weight.