Q. What should one do when encountering such situation ? (see above question 1035)

A. Horav Shlomo Miller’s Shlit”a opinion is similar to other Poskims advice to follow the psak of the majority (Horav Moshe Heineman Shlit”a as quoted by Rabbi D. Haber in Traveller’s Guide to the International Dateline). However, Horav Miller maintains that until one is certain that the Sefer Hayoman’s (144.8 W) dateline has been crossed and it is Erev Shabbos again according to all opinions, one should abstain from all melochos. Using the bathroom will turn on lights when closing the door, flushing the toilet is also an issue. One should also refrain from eating or drinking, since it would be without Kiddush, that cannot be recited since it is a sofek brocho.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a