Input (grade 8): The 921 earthquake (), also known as the 1999 Jiji earthquake () or simply 921 (), was a magnitude 7.6 earthquake which occurred at 1:47 local time (17:47 UTC) on September 21, 1999 in Jiji, Nantou, Taiwan.
Output (grade 7): The earthquake happened on September 21, 1999 at 1:47 am local time (September 20 17:47 GMT).