Genesis 11:27 (KJV)

Now these are the generations  of Terah: Terah begat Abram, Nahor, and Haran; and Haran begat Lot

‘Generations of Terah’ is followed by subsequent generations described later in the passage. This is not the very first of the generations (Adam was) so Terah is not acknowledged as being ‘created’ or given the importance  of  ‘in the day’.