I think I figured out why Trump is either the 44th President of the 45th President depending on how you count. I think they were thinking far ahead to Tishabav 2019 because the Torah portion Tishabav usually falls on is 44 but this year it's delayed a day because it fell on the Sabbath so it falls on the first day of the
45th week of Torah portion . That's probably why the Mayor of San Francisco turns 45 the same day the Torah portion reading turns 45. Because Tishbav falls on the Sabbath this year it's also a special Sabbath.
Sat, 10 August 2019 = 9th of Av, 5779
ט׳ בְּאָב תשע״ט
Parashat Devarim (in Diaspora)
Parashat Devarim is the 44th weekly Torah portion in the annual Jewish cycle of Torah reading.
Shabbat Chazon / שבת חזון
Shabbat Chazon ("Sabbath [of] vision" שבת חזון) takes its name from the Haftarah that is read on the Shabbat immediately prior to the mournful fast of Tisha B'Av, from the words of rebuke and doom coming from Isaiah in the Book of Isaiah 1:1-27. It is also referred to as the Black Sabbath due to its status as the saddest Shabbat of the year (as opposed to the White Sabbath, Shabbat Shuvah, immediately precededing Yom Kippur).
Shabbat Chazon begins at sundown on Fri, 09 August 2019.
Erev Tish'a B'Av
Sun, 11 August 2019 = 10th of Av, 5779
י׳ בְּאָב תשע״ט
Parashat Vaetchanan (in Diaspora)
Parashat Vaetchanan is the 45th weekly Torah portion in the annual Jewish cycle of Torah reading.