Simchat Torah for the year 2021 is celebrated/ observed on sundown of Tuesday, September 28th ending at sundown on Wednesday, September 29.
Simchat Torah which means rejoicing with the Torah on the Hebrew calendar falls on 22 Tishrei (Israel) and 23 Tishrei (outside Israel). In Israel many will celebrate both Shemini Atzeret and Simchat Torah on the same day which happens to follow directly after the seven day holiday of Sukkot. Outside Israel many Jews will celebrate Simchat Torah the day after Shemini Atzeret is celebrated thus celebrated on 23 Tishrei.
Days to the start of Simchat Torah 2021
Wednesday, September 29th is day number 272 of the 2021 calendar year with 1 year, 10 months, 7 days until Simchat Torah 2021.